Molcan Corporation (Page 11) @ ChemBuyersGuide.com, Inc.

4-(2-Hydroxypropan-2-yl)-2-propyl-1-({4-[2-(2H-1,2,3,4-tetrazol-5-yl)phenyl]phenyl}methyl)-1H-imidazole-5-carboxylic acid
CAS:144689-24-7
Olmesartan EP Impurity A Olmesartan Acid
OLM01

4-(2-Hydroxypropan-2-yl)-2-propyl-1-({4-[2-(2H-1,2,3,4-tetrazol-5-yl)phenyl]phenyl}methyl)-1H-imidazole-5-carboxylic acid ethyl ester
CAS:144689-23-6
Olmesartan Ethyl Ester
OLM31

4-(2-Hydroxypropan-2-yl)-2-propyl-1-({4-[2-(2H-1,2,3,4-tetrazol-5-yl)phenyl]phenyl}methyl)-1H-imidazole-5-carboxylic acid methyl ester
CAS:1347262-29-6
Olmesartan Methyl Ester
OLM34

4-(2-Methoxyethyl)benzenamine
CAS:84803-56-5
Metoprolol RC 1
MTP61

4-(2-METHOXYETHYL)PHENOL
CAS:56718-71-9
Metoprolol EP Impurity B
MTP02

4-(2-METHYL-1H-IMIDAZOL-1-YL)-2,2-DIPHENYLBUTANAMIDE
CAS:170105-16-5
Imidafenacin (Base)
IFN00B

4-(2-METHYL-1H-IMIDAZOL-1-YL)-2,2-DIPHENYLBUTANAMIDE HYDROCHLORIDE
CAS:893421-54-0
Imidafenacin (HCl) Imidafenacin Hydrochloride
IFN00H

4-(2-Methyl-1H-imidazol-1-yl)-2,2-diphenylbutanoic acid
Imidafenacin RC 1 (Base)
IFN61B

4-(2-Methyl-1H-imidazol-1-yl)-2,2-diphenylbutanoic acid hydrochloride
CAS:174266-18-3
Imidafenacin RC 1 (HCl)
IFN61H

4-(2-Methylpropoxy)benzaldehyde oxime
CAS:882035-15-6
Pimavanserin RC 11
PVN71

4-(2-Methylpropyl)-2-pyrrolidinone 4-Isobutyl-2-pyrrolidinone
CAS:61312-87-6
Pregabalin USP RC C rac-Pregabalin Lactam Impurit
PRG23

4-(2-OXIRANYLMETHOXY) BENZENEACETIC ACID ETHYL ESTER
CAS:76805-25-9
Metoprolol Epoxy Ethyl Ester
MTP37

4-(2-Oxo-1,2,3,4-tetrahydroquinolin-7-yloxy)butanal
CAS:1359159-59-3
Brexpiprazole Impurity 8
BRX68

4-(2-tert-Butylamino-ethyl)-2-hydroxymethyl-phenol
CAS:1823256-56-9
Levalbuterol USP RC A 1-Deshydroxy Albuterol
LAB21B

4-(3'-Chlorobiphenyl-4-yl)-1-[4-(4-?uorophenyl)-4-oxobutyl]piperidin-4-yl decanoate
CAS:1797131-50-0
Haloperidol Decanoate EP Impurity F
HPD06B

4-(3,4-DICHLOROPHENYL)-4-PHENYLBUTANOIC ACID
CAS:79560-18-2
Sertraline RC 13
STL73

4-(3,4-DIHYDRO-1-METHYL-2(1H)-ISOQUINOLINYL)-N-(4-FLUOROPHENYL)-5,6-DIMETHYL-2-PYRIMIDINAMINE
CAS:199463-33-7
Revaprazan (Base)
RVP00B

4-(3,4-Dihydro-1-methyl-2(1H)-isoquinolinyl)-N-(4-fluorophenyl)-5,6-dimethyl-2-pyrimidinamine hydrochloride
CAS:178307-42-1
Revaprazan HCl
RVP00H

4-(3,5-Dichloro-4-methoxyphenylamino)-6-methoxy-7-(3-(4-methylpiperazin-1-yl)propoxy)quinoline-3-carbonitrile
CAS:1391063-17-4
Bosutinib Impurity 26
BST86

4-(3-((3-Cyano-4-((2,4-dichloro-5-methoxyphenyl)amino)-6-methoxyquinolin-7-yl)oxy)propyl)-1-methylpiperazine 1-oxide
CAS:2468737-96-2
Bosutinib N-Oxide
BST50

4-(3-(1-(4--CYANO-3-(TRIFLUOROMETHYL)PHENYL)METHYL-4-OXO-2-THIOXO-1,2,3,4-TETRAHYDROQUINAZOLIN-7-YL)-4,4-DIMETHYL-5-OXO-2-THIOXOIMIDAZOLIDIN-1-YL)-2-(TRIFLUOROMETHYL)BENZONITRILE
CAS:915087-33-1
Enzalutamide Impurity 11 Enzalutamide Impurity F
EZL71

4-(3-(1-(Cyclopropanecarbonyl)piperazine-4-carbonyl)benzyl)phthalazin-1(2H)-one
CAS:763113-06-0
Olaparib RC 4 Desfluoro Olaparib
OPB64

4-(3-(2-Chloro-10H-phenothiazin-10-yl)propyl)-1-methylpiperazine 1-oxide
CAS:150111-55-0
Prochlorperazine RC 9 Prochlorperazine N-Oxide
PCR69

4-(3-(3-(4-Acetyl-3-hydroxy-2-propylphenylthio)propoxy)-6-(1-hydroxyethyl)-2-propylphenoxy)butanoic acid
CAS:1027597-04-1
Tipelukast Hydroxy Impurity
TLK50

4-(3-(4-(3-Chloro-4-fluorophenylamino)-7-methoxyquinazolin-6-yloxy)propyl)morpholin-3-one
CAS:847949-52-4
Gefitinib RC 6
GFT66

4-(3-(4-(CYCLOPROPANECARBONYL)-3-HYDROXYPIPERAZINE-1-CARBONYL)-4-FLUOROBENZYL)PHTHALAZIN-1(2H)-ONE
Olaparib Metabolite M18
OPB18

4-(3-(4-CARBAMOYL-3-(TRIFLUOROMETHYL)PHENYL)-5,5-DIMETHYL-4-OXO-2-THIOXOIMIDAZOLIDIN-1-YL)-2-FLUORO-N-METHYLBENZAMIDE
CAS:2030242-21-6
Enzalutamide Impurity 19
EZL79

4-(3-(4-Chloro-3-(trifluoromethyl)phenyl)ureido)-3-fluorophenyl 4-chloro-3-(trifluoromethyl)phenylcarbamate
Regorafenib RC 3
RGR63

4-(3-(4-CYANO-3-(TRIFLUOROMETHYL)PHENYL)-5,5-DIMETHYL-2,4-DIOXOIMIDAZOLIDIN-1-YL)-2-FLUORO-N-METHYLBENZAMIDE
CAS:1242137-18-3
Enzalutamide Oxo Impurity
EZL40

4-(3-(4-CYANO-3-(TRIFLUOROMETHYL)PHENYL)-5,5-DIMETHYL-2,4-DIOXOIMIDAZOLIDIN-1-YL)-2-FLUOROBENZOIC ACID
CAS:1242137-19-4
Enzalutamide Impurity 20
EZL80

4-(3-(4-CYANO-3-(TRIFLUOROMETHYL)PHENYL)-5,5-DIMETHYL-4-OXO-2-THIOXOIMIDAZOLIDIN-1-YL)-2-FLUORO-N,N-DIMETHYLBENZAMIDE
CAS:1443331-78-9
Enzalutamide N,N-Dimethyl Analog N,N-Dimethyl Enz
EZL53

4-(3-(4-CYANO-3-(TRIFLUOROMETHYL)PHENYL)-5,5-DIMETHYL-4-OXO-2-THIOXOIMIDAZOLIDIN-1-YL)-N-METHYLBENZAMIDE
CAS:915087-16-0
Enzalutamide Desfluoro Impurity
EZL39

4-(3-(BENZYLTHIO)PHENYL)-6,8-DICHLORO-2-METHYL-1,2,3,4-TETRAHYDROISOQUINOLINE
CAS:1234366-98-3
Tenapanor RC 3
TPR63B

4-(3-(Hydroxymethyl)phenylamino)pyridine-3-sulfonamide
CAS:1329838-21-2
Torsemide RC 3
TSM63

4-(3-(Piperazine-4-carbonyl)benzyl)phthalazin-1(2H)-one
Olaparib RC 8
OPB68

4-(3-AMINOPHENYL)MORPHOLIN-3-ONE
CAS:1082495-22-4
Rivaroxaban Impurity 32
RVR92

4-(3-BROMOPHENYL)-6,8-DICHLORO-2-METHYL-1,2,3,4-TETRAHYDROISOQUINOLINE
CAS:543737-10-6
Tenapanor RC 8 (Base)
TPR68B

4-(3-BROMOPHENYL)-6,8-DICHLORO-2-METHYL-1,2,3,4-TETRAHYDROISOQUINOLINE HCL
CAS:543739-81-7
Tenapanor RC 8 (HCl)
TPR68H

4-(3-Carbamoyl-6-(4-(3-hydroxy-2-oxopiperidin-1-yl)phenyl)-7-oxo-4,5,6,7-tetrahydropyrazolo[3,4-c]pyridin-1-yl)phenyl hydrogen sulfate
CAS:2203515-00-6
Apixaban Impurity 28
APX88

4-(3-carboxy-1-ethyl-6-fluoro-4-oxo-1,4-dihydroquinolin-7-yl)-1-methylpiperazine 1-oxide
CAS:85145-21-7
Pefloxacin EP Impurity D Pefloxacin N-Oxide
PFX04

4-(3-CHLORO-4-(3-CYCLOPROPYLUREIDO)PHENOXY)-7-METHOXYQUINOLINE-6-CARBOXYLIC ACID
CAS:417717-21-6
Lenvatinib Carboxylic Acid Desamino Hydroxy Lenva
LVT50

4-(3-Chloro-4-(pyridin-2-ylmethoxy)phenylamino)-7-ethoxy-6-(2-hydroxy-5-oxopyrrolidin-1-yl)quinoline-3-carbonitrile
CAS:1144516-15-3
Neratinib Impurity 10
NTB60

4-(3-CHLORO-4-FLUOROPHENYLAMINO)-7-METHOXYQUINAZOLIN-6-YL ACETATE
CAS:788136-89-0
Gefitinib RC 5
GFT65

4-(3-Chloro-4-methoxybenzylamino)-2-(methylthio)pyrimidine-5-carboxylic acid
CAS:330786-34-0
Avanafil RC 6
AVF56

4-(3-Fluoro-4-(2-(methylcarbamoyl)pyridin-4-ylamino)phenoxy)-N-methylpicolinamide
CAS:1855006-12-0
Regorafenib EP Impurity C Regorafenib Dipyrimidin
RGA03

4-(3-FLUOROBENZYLOXY)BENZOIC ACID
CAS:405-85-6
Safinamide Benzoic Acid Impurity
SFN52

4-(3-METHOXYPROPOXY)-3-METHYLPYRIDINE-2-CARBOXYLIC ACID
CAS:1163685-31-1
Rabeprazole Carboxylic Acid Impurity
RBP45

4-(3-Methyl-1-oxa-3-azaspiro[5.5]undec-5-yl)phenol
CAS:1346601-55-5
Desvenlafaxine Cyclic Impurity Desvenlafaxine Spi
DVL75B

4-(3-Methyl-1-oxa-3-azaspiro[5.5]undec-5-yl)phenol
CAS:1346601-55-5
Venlafaxine O-Desmethyl Cyclic Impurity Venlafaxi
VLF75B

4-(3-METHYLPHENYL)-2H-PYRIDO[4,3-E]-1,2,4-THIADIAZIN-3(4H)-ONE 1,1-DIOXIDE
CAS:72810-61-8
Torsemide EP Impurity A (Acid) Torsemide USP RC E
TSM01A

4-(3-METHYLPHENYL)-2H-PYRIDO[4,3-E]-1,2,4-THIADIAZIN-3(4H)-ONE 1,1-DIOXIDE SODIUM SALT
Torsemide EP Impurity A (Sodium) Torsemide USP RC
TSM01N

4-(4'-Hydroxybiphenyl-4-yl)-4-oxobutanoic acid
Fenbufen EP Impurity D
FBF04

4-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)BENZENESULFONAMIDE
CAS:214360-51-7
Valdecoxib RC 6
VXB66

4-(4-((((S)-2-OXO-3-(((S)-2-OXO-3-(4-(3-OXOMORPHOLINO)PHENYL)OXAZOLIDIN-5-YL)METHYL)OXAZOLIDIN-5-YL)METHYL)AMINO)PHENYL)MORPHOLIN-3-ONE
Rivaroxaban Impurity 3 Rivaroxaban Di-Oxazolidino
RVR63

4-(4-(((S)-2-Oxo-3-(((S)-2-oxo-3-(4-(3-oxomorpholino)phenyl)oxazolidin-5-yl)methyl)oxazolidin-5-yl)methylamino)phenyl)morpholin-3-one
Rivaroxaban Impurity 25
RVR85

4-(4-(2-(4-(((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluorophenyl)-tetrahydrofuran-3-yl)methoxy)phenylamino)ethylamino)phenyl)-2-((2S,3S)-2-hydroxypentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
CAS:1370190-94-5
Posaconazole Desethylene Impurity Posaconazole DP
PSC77

4-(4-(3-((2R,3R,4S,5S,6S)-6-Carboxy-3,4,5-trihydroxytetrahydro-2H-pyran-2-yl)-3-(4-chloro-3-(trifluoromethyl)phenyl)ureido)-3-fluorophenoxy)-2-(methylcarbamoyl)pyridine 1-Oxide
Regorafenib N-�-D-Glucuronide Pyridine-N-oxide
RGR55

4-(4-(3-(2-Chloro-3-(trifluoromethyl)phenyl)ureido)-3-fluorophenoxy)-N-methylpicolinamide
Regorafenib 2-Chloro Impurity
RGR50

4-(4-(3-(4-(((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluorophenyl)-tetrahydrofuran-3-yl)methoxy)phenyl)imidazolidin-1-yl)phenyl)-2-((2S,3S)-2-hydroxypentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
CAS:1388148-29-5
Posaconazole Imidazolidine Analog
PSC57

4-(4-(3-(4-Chloro-3-(trifluoromethyl)phenyl)ureido)-3-(4-(3-(4-chloro-3-(trifluoromethyl)phenyl)ureido)-3-fluorophenoxy)phenoxy)-N-methylpicolinamide
CAS:2098799-13-2
Regorafenib EP Impurity E
RGA05

4-(4-(3-(4-CHLORO-3-(TRIFLUOROMETHYL)PHENYL)UREIDO)-3-FLUOROPHENOXY)PICOLINIC ACID
CAS:1187945-05-6
Regorafenib RC 4
RGR64

4-(4-(3-Aminopropylamino)phenyl)morpholin-3-one
CAS:1816946-19-6
Rivaroxaban Impurity 7
RVR67

4-(4-(3-Chloro-4-fluorophenylamino)-7-((S)-tetrahydrofuran-3-yloxy)quinazolin-6-ylamino)-1-(dimethylamino)-4-oxobutane-2-sulfonic acid
CAS:2283295-16-7
Afatinib RC 13 Afatinib Sulfonic Acid Analog
AFN83

4-(4-(4-(((2R,4S)-2-((1H-1,2,4-Triazol-1-yl)methyl)-2-(2,4-dichlorophenyl)-1,3-dioxolan-4-yl)methoxy)phenyl)piperazin-1-yl)benzenamine
CAS:1437468-62-6
Itraconazole Aniline Impurity
ICZ45

4-(4-(4-(4-(((2R,4S)-2-((1H-1,2,4-Triazol-1-yl)methyl)-2-(2,4-dichloro phenyl)-1,3-dioxolan-4-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-2H-1,2,4-triazol-3(4H)-one
CAS:89848-41-9
Itraconazole N-Desalkyl Impurity
ICZ40

4-(4-(4-(4-(((2R,4S)-2-((1H-1,2,4-Triazol-1-yl)methyl)-2-(2,4-dichloro phenyl)-1,3-dioxolan-4-yl)methoxy)phenyl)piperazin-1-yl)phenyl)semicarbazide
CAS:89848-13-5
Itraconazole Hydrazinyl Impurity
ICZ42

4-(4-(4-(4-(((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluoro phenyl)-tetrahydrofuran-3-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-2-((2S,3S)-2-(benzyloxy)pentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
CAS:170985-86-1
Posaconazole O-Benzyl Impurity
PSC70

4-(4-(4-(4-(((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluoro phenyl)-tetrahydrofuran-3-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-2H-1,2,4-triazol-3(4H)-one
CAS:161532-56-5
Posaconazole Deshydroxypentanyl Impurity
PSC55

4-(4-(4-(4-(((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluorophenyl) -tetrahydro furan-3-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-2-((2S,3S)-2-hydroxypentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
CAS:171228-49-2
Posaconazole
PSC00

4-(4-(4-(4-(((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluorophenyl)-tetrahydro furan-3-yl)methoxy)phenyl)-1-oxido-piperazin-1-yl)phenyl)-2-((2S,3S)-2-hydroxypentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
CAS:1902954-03-3
Posaconazole 1-Oxido Impurity Posaconazole DP1 Im
PSC61

4-(4-(4-(4-(((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluorophenyl)-tetrahydrofuran-3-yl)methoxy)phenyl)-1,4-dioxido-piperazin-1-yl)phenyl)-2-((2S,3S)-2-hydroxypentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
CAS:1902957-95-2
Posaconazole Dioxido Impurity Posaconazole DP3 Im
PSC56

4-(4-(4-(4-(((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluorophenyl)-tetrahydrofuran-3-yl)methoxy)phenyl)-4-oxido-piperazin-1-yl)phenyl)-2-((2S,3S)-2-hydroxypentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
CAS:1902954-05-5
Posaconazole 4-Oxido Impurity Posaconazole DP2 Im
PSC74

4-(4-(4-(4-(((3R,5R)-5-((1H-1,2,4-triazol-1-yl)methyl)-5-(2,4-difluorophenyl)-tetrahydrofuran-3-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-2-((2R,3R)-2-hydroxypentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
CAS:170985-61-2
Posaconazole (2R,3R)-Isomer
PSC53

4-(4-(4-(4-(((3R,5R)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2-fluorophenyl)-tetrahydrofuran-3-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-2-((2S,3S)-2-hydroxypentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
Posaconazole 4-Desfluoro Impurity
PSC64

4-(4-(4-(4-(((3R,5S)-5-((1H-1,2,4-Triazol-1-yl)methyl)-5-(2,4-difluorophenyl)-tetrahydrofuran-3-yl)methoxy)phenyl)piperazin-1-yl)phenyl)-2-((2S,3S)-2-hydroxypentan-3-yl)-2H-1,2,4-triazol-3(4H)-one
Posaconazole Enantiomer
PSC54

4-(4-(4-(4-Methoxyphenyl)piperazin-1-yl)phenyl)-2H-1,2,4-triazol-3(4H)-one
CAS:74853-07-9
Posaconazole Methoxy Triazole Impurity Itraconazo
PSC59

4-(4-(4-(Methoxymethoxy)phenyl)piperazin-1-yl)benzenamine
CAS:1246815-17-7
Posaconazole Methoxy Amino Impurity
PSC68

4-(4-(4-Trifluoromethoxy-phenoxy)piperidin-1-yl)phenol
CAS:681482-81-5
Delamanid Phenol Impurity
DLM52

4-(4-(BENZO[B]THIOPHEN-4-YL)PIPERAZIN-1-YL)BUTAN-1-OL
CAS:913614-15-0
Brexpiprazole Impurity 18 Brexpiprazole Desquinol
BRX78

4-(4-(Dimethylamino)-1-(4-fluorophenyl)but-1-enyl)-3-(hydroxymethyl)benzonitrile
CAS:920282-75-3
Citalopram Impurity 1 Citalopram EP Impurity I C
CTL61B

4-(4-(HYDROXYDIPHENYLMETHYL)PIPERIDIN-1-YL)-1-(4-ISOPROPYLPHENYL)BUTAN-1-ONE
CAS:185066-40-4
Fexofenadine RC 1
FXF61B

4-(4-(METHYLSULFONYL)PHENYL)-3-PHENYLFURAN-2(5H)-ONE
CAS:162011-90-7
Rofecoxib
RCX00

4-(4-(PYRIMIDIN-2-YL)PIPERAZIN-1-YL)BUTYL 2-(1-(2-OXO-2-((4-(4-(PYRIMIDIN-2-YL)PIPERAZIN-1-YL)BUTYL)AMINO)ETHYL)CYCLOPENTYL)ACETATE
CAS:2512210-24-9
Buspirone EP Impurity F (Base) Buspirone Open-Rin
BPR06B

4-(4-(Pyrimidin-2-yl)piperazin-1-yl)butyl 2-(1-(2-Oxo-2-((4-(4-(pyrimidin-2-yl)piperazin-1-yl)butyl)amino)ethyl)cyclopentyl)acetate oxalate
Buspirone EP Impurity F (Oxalate) Buspirone Open-
BPR06X

4-(4-{3-[2-Chloro-3-(trifluoromethyl)phenyl]ureido}phenoxy)-N-methylpicolinamide
CAS:1431697-81-2
Sorafenib EP Impurity H Sorafenib 2-Chloro Analog
SRF08

4-(4-ACETAMIDO-3-FLUOROPHENOXY)-N-METHYLPICOLINAMIDE
CAS:2141961-84-2
Regorafenib EP Impurity B
RGA02

4-(4-AMINO-3-(4-AMINO-3-FLUOROPHENOXY)PHENOXY)-N-METHYLPICOLINAMIDE
CAS:2098799-12-1
Regorafenib RC 2 (Base)
RGR62B

4-(4-AMINO-3-(4-AMINO-3-FLUOROPHENOXY)PHENOXY)-N-METHYLPICOLINAMIDE HYDROCHLORIDE
Regorafenib RC 2 (HCl)
RGR62H

4-(4-AMINO-3-CHLOROPHENOXY)-7-METHOXYQUINOLINE-6-CARBOXAMIDE
CAS:417722-93-1
Lenvatinib Impurity 4
LVT64

4-(4-Amino-3-fluorophenoxy)-N-(2-fluoro-4-(2-(methylcarbamoyl)pyridin-4-yloxy)phenyl)picolinamide hydrochloride
Regorafenib RC 1
RGR61H

4-(4-AMINO-3-FLUOROPHENOXY)-N-METHYLPICOLINAMIDE
CAS:757251-39-1
Regorafenib EP Impurity A Regorafenib USP RC A
RGR01

4-(4-AMINO-5-(ETHYLSULFONYL)-2-METHOXYBENZAMIDO)-5-(ETHYLSULFONYL)-2-METHOXYBENZOIC ACID
Amisulpride RC 3
ASD53

4-(4-AMINOPHENOXY)PICOLINIC ACID
CAS:1012058-77-3
Sorafenib RC 3
SRF63

4-(4-AMINOPHENYL)MORPHOLIN-3-ONE
CAS:438056-69-0
Rivaroxaban Impurity 6
RVR66

4-(4-Aminophenylsulfonyl)benzenamine
CAS:80-08-0
Dapsone
DPS00B

4-(4-Aminophenylsulfonyl)phenol
CAS:25963-47-7
Dapsone Hydroxy Analog Dapsone Impurity A
DPS53B

4-(4-Bromo-2-fluoroanilino)-6-methoxy-7-[(1-methylpiperidin-4-yl) methoxy] quinazoline
CAS:443913-73-3
Vandetanib
VDT00

4-(4-CHLORO-1,2,5-THIADIAZOL-3-YL)MORPHOLINE
CAS:30165-96-9
Timolol EP Impurity F Timolol BP Impurity F Timo
TML06B

4-(4-Chloro-3-fluorophenylamino)-6-nitroquinazolin-7-ol
CAS:2475094-95-0
Afatinib RC 1
AFN71

4-(4-Chlorobenzyl)-2-[(4RS)-1-methylhexahydro-1H-azepin-4-yl]phthalazin-1(2H)-one hydrochloride
CAS:79307-93-0
Azelastine HCl
AZN00H

4-(4-Chlorobenzyl)-2-[(4RS)-hexahydro-1H-azepin-4-yl]phthalazin-1(2H)-one
CAS:47491-38-3
Azelastine N-Desmethyl Analog N-Desmethyl Azelast
AZN53

4-(4-CHLOROBENZYL)PHTHALAZIN-1(2H)-ONE
CAS:53242-88-9
Azelastine EP Impurity D Azelastine USP RC D
AZN04

4-(4-CHLOROBUTYL)PYRIDINE
CAS:5264-17-5
Tirofiban RC 1 (Base)
TRF51B

4-(4-CHLOROBUTYL)PYRIDINE HYDROCHLORIDE
CAS:149463-65-0
Tirofiban RC 1 (HCl)
TRF51H

4-(4-Chlorophenyl)-1,1-bis[4-(dimethylamino)-4-oxo-3,3-diphenylbutyl]-4-hydroxypiperidinium bromide
Loperamide EP Impurity B
LPA02

4-(4-CHLOROPHENYL)-1-(1H-IMIDAZOL-1-YL)BUTAN-2-OL
CAS:67085-11-4
Butoconazole 2-Hydroxy Impurity
BCZ62

4-(4-Chlorophenyl)-1-[4-(2-?uorophenyl)-4-oxobutyl]piperidin-4-yl decanoate
CAS:1798004-21-3
Haloperidol Decanoate EP Impurity B (Base) 4-Deflu
HPD02B

4-(4-Chlorophenyl)-1-[4-(2-?uorophenyl)-4-oxobutyl]piperidin-4-yl decanoate HCl
Haloperidol Decanoate EP Impurity B (HCl) 4-Defluo
HPD02H

4-(4-Chlorophenyl)-1-[4-(3-ethyl-4-?uorophenyl)-4-oxobutyl]piperidin-4-yl decanoate
CAS:1391052-87-1
Haloperidol Decanoate EP Impurity C (Base) 3-Ethy
HPD03B

4-(4-Chlorophenyl)-1-[4-(3-ethyl-4-?uorophenyl)-4-oxobutyl]piperidin-4-yl decanoate HCl
CAS:1797982-02-5
Haloperidol Decanoate EP Impurity C (HCl) 3-Ethyl
HPD03H

4-(4-Chlorophenyl)-1-[4-(4-?uorophenyl)-4-oxobutyl]piperidin-4-yl dodecanoate
CAS:65135-24-2
Haloperidol Decanoate EP Impurity K Haloperidol L
HPD11B

4-(4-Chlorophenyl)-1-[4-(4-?uorophenyl)-4-oxobutyl]piperidin-4-yl octanoate
CAS:1134807-34-3
Haloperidol Decanoate EP Impurity H Haloperidol O
HPD08B

4-(4-Chlorophenyl)-1-[4-(4-?uorophenyl)-4-oxobutyl]piperidin-4-yl undecanoate
CAS:1797983-18-6
Haloperidol Decanoate EP Impurity J Haloperidol U
HPD10B

4-(4-Chlorophenyl)-1-[4-(4-?uorophenyl)-4-oxobutyl]piperidin-4-ylnonanoate
CAS:2512216-30-5
Haloperidol Decanoate EP Impurity I Haloperidol No
HPD09B

4-(4-Chlorophenyl)-1-[4-(4-?uorophenyl)-4oxobutyl]piperidin-4-yl decanoate
CAS:74050-97-8
Haloperidol decanoate
HPD00B

4-(4-Chlorophenyl)-1-[4-(4-?uorophenyl)-4oxobutyl]piperidin-4-yl decanoate N-oxide
Haloperidol Decanoate N-Oxide
HPD50

4-(4-CHLOROPHENYL)-1-[4-[4-(4-CHLOROPHENYL)-4-HYDROXYPIPERIDIN-1-YL]-2,2-DIPHENYLBUTANOYL]PIPERIDIN-4-OL
CAS:1426322-82-8
Loperamide EP Impurity E
LPA05B

4-(4-Chlorophenyl)-1-[4-[4-[4-(4-chlorophenyl)-4-hydroxypiperidin-1-yl]phenyl]-4-oxobutyl]piperidin-4-yl decanoate
CAS:1797008-46-8
Haloperidol Decanoate EP Impurity D
HPD04B

4-(4-CHLOROPHENYL)-3,4-DIHYDRONAPHTHALEN-1(2H)-ONE
CAS:36159-73-6
Sertraline RC 2
STL62

4-(4-CHLOROPHENYL)-4-HYDROXYPIPERIDINE
CAS:39512-49-7
Loperamide EP Impurity C
LPA03B

4-(4-CHLOROPHENYL)-4-OXOBUTANOIC ACID
CAS:3984-34-7
Fenbufen 4-Chlorophenyl Butanoic Acid
FBF54

4-(4-Chlorophenyl)cyclohex-3-enecarboxylic acid
CAS:165317-79-3
Atovaquone RC 4
ATQ64

4-(4-Chlorophenyl)cyclohexyl 3-chloro-1,4-dioxo-1,4-dihydronaphthalene-2-carboxylate
CAS:215672-88-1
Atovaquone RC 5
ATQ65

4-(4-CHLOROPHENYLSULFONYL)BENZENAMINE
CAS:7146-68-1
Dapsone Chloro Analog Dapsone Impurity E
DPS51B

4-(4-CHLOROPYRIMIDIN-2-YLAMINO)BENZONITRILE
CAS:244768-32-9
Rilpivirine Chloro Impurity
RLP56B

4-(4-Fluoro-2-methylindol-5-yloxy)-6-methoxy-7-[3-(pyrrolidin-1-yl)propoxy] quinazoline
CAS:288383-20-0
Cediranib
CDR00

4-(4-Fluoro-3-(piperazine-4-carbonyl)benzyl)phthalazin-1(2H)-one
CAS:763111-47-3
Olaparib RC 5 Descyclopropanecarbonyl Olaparib
OPB65

4-(4-FLUOROBENZOYL)-3-(HYDROXYMETHYL)BENZONITRILE
CAS:260371-16-2
Citalopram Impurity 3
CTL63

4-(4-Fluorophenyl)-1-methyl-1,2,3,6-tetrahydro pyridine
CAS:69675-10-1
Paroxetine HCl Hemihydrate EP Impurity G (Base) P
PRX07B

4-(4-Fluorophenyl)-1-methyl-1,2,3,6-tetrahydro pyridine HCl
CAS:1012886-75-7
Paroxetine HCl Hemihydrate EP Impurity G (HCl) Pa
PRX07H

4-(4-Fluorophenyl)-2,4-dihydroxy-2-isopropyl-N,5-diphenyl-3,6-dioxabicyclo [3.1.0]hexane-1-carboxamide
CAS:873950-19-7
Atorvastatin Epoxy THF Analog Atorvastatin Epoxy
ATV23

4-(4-Fluorophenyl)-4-hydroxy-1-methyl-piperidine
Paroxetine 4-Hydroxy Piperidine Impurity
PRX77

4-(4-Fluorophenyl)-6-(1-methylethyl)-N,2-diphenyl-5-[2-(tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-3,7-dioxa-5-azatricyclo[4.1.0.02,4] heptane-1-carboxamide
CAS:1046118-40-4
Atorvastatin Diepoxide Lactone
ATV62

4-(4-FORMAMIDOPHENOXY)-N-METHYLPICOLINAMIDE
CAS:2004659-84-9
Sorafenib EP Impurity B
SRF02

4-(4-HYDROXY-3,5-DIIODOPHENOXY)-3,5-DIIODO-N-METHYLBENZAMIDE
CAS:2088032-78-2
Levothyroxine T4-Formic Acid-N-Methylamide
LTX58

4-(4-HYDROXY-3,5-DIIODOPHENOXY)-3,5-DIIODOBENZALDEHYDE
CAS:2016-06-0
Levothyroxine EP Impurity I T4-Aldehyde (USP) Le
LTX09

4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodobenzoic acid 3,3',5,5'-Tetraiodo Thyroformic Acid
CAS:2055-97-2
Levothyroxine EP Impurity H T4-Benzoic Acid (USP)
LTX08

4-(4-Hydroxy-3-(hydroxymethyl)butylamino)-2-imino-1,2-dihydroimidazol-5-one
Penciclovir Impurity 4
PCV54

4-(4-HYDROXY-4-PHENYLPIPERIDIN-1-YL)-N,N-DIMETHYL-2,2-DIPHENYLBUTANAMIDE
CAS:37743-41-2
Loperamide EP Impurity D
LPA04B

4-(4-Hydroxy-phenoxy)-3,5-diiodobenzaldehyde
CAS:2828-49-1
Levothyroxine Hydroxyphenoxy Aldehyde Impurity 3,
LTX37

4-(4-HYDROXYPHENYL)BUTAN-2-ONE
CAS:5471-51-2
Dobutamine EP Impurity B
DBM02

4-(4-Hydroxyphenylamino)phenol
CAS:1752-24-5
Paracetamol EP Impurity M (Base)
PCM13B

4-(4-Hydroxyphenylamino)phenol HCl
CAS:1965310-24-0
Paracetamol EP Impurity M (HCl)
PCM13H

4-(4-Hydroxyphenylimino)cyclohexa-2,5-dienone
CAS:500-85-6
Indophenol
IPN00

4-(4-Methoxyphenoxy)-3,5-diiodobenzaldehyde
CAS:69240-57-9
Levothyroxine Methoxyphenoxy Aldehyde Impurity 3,
LTX38

4-(4-Methylpiperazin-1-yl)-2-(tetrahydro-2H-pyran-4-ylamino)benzoic acid
CAS:1889328-86-2
Entrectinib RC 6
ETX66

4-(4-Methylpiperazin-1-yl)-2-(tetrahydro-2H-pyran-4-ylamino)benzoyl chloride
CAS:1889329-44-5
Entrectinib RC 2
ETX62

4-(4-Nitrobenzyl)oxazolidin-2-one
CAS:340041-92-1
Zolmitriptan Impurity 3
ZMT63

4-(4-NITROPHENYL)MORPHOLIN-3-ONE
CAS:446292-04-2
Rivaroxaban Impurity 1 Rivaroxaban Nitro Impurity
RVR61

4-(4-NITROPHENYL)MORPHOLINE
CAS:10389-51-2
Linezolid RC 5
LNZ65

4-(4-PHENYLBUTOXY)BENZOIC ACID
CAS:30131-16-9
Pranlukast Benzoic Acid Impurity
PRL59

4-(4H-Benzo[4,5]cyclohepta[1,2-b]thiophen-4-ylidene)-1-methylpiperidine
CAS:4673-38-5
Ketotifen EP Impurity A 10-Deoxo-9,10-Dehydro Ket
KTT01

4-(5,6-Dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-piperidine
CAS:38092-95-4
Desloratadine Deschloro Impurity N-Desmethyl Azat
DLR50

4-(5,6-Diphenylpyrazin-2-ylamino)butan-1-ol
CAS:2514706-51-3
Selexipag RC 3 Selexipag DPB Desisopropyl Impurit
SLX53

4-(5,7-Dihydroxy-4-Oxo-4H-Chromen-2-Yl)Phenyl Hydrogen Sulfate
CAS:116353-75-4
Apigenin 4-O-Sulfate (Acid)
APG52A

4-(5-((1H-1,2,4-TRIAZOL-1-YL)METHYL)-2-AMINOPHENYL)BUT-3-YN-1-OL
CAS:1329797-47-8
Rizatriptan Impurity 6
RZT66

4-(5-((1H-1,2,4-Triazol-1-yl)methyl)-3-(2-(dimethylamino)ethyl)-1H-indol-1-yl)-4-(5-((1H-1,2,4-triazol-1-yl)methyl)-3-(2-(dimethylamino)ethyl)-1H-indol-2-yl)-N,N-dimethylbutan-1-amine
CAS:1135479-41-2
Rizatriptan Impurity 3
RZT63

4-(5-((2-((4-(5-(Bis(2-chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoyl)oxy)ethyl)(2-chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoate allyl ester
Bendamustine Dimer 2-Allyl Ester
BDM56

4-(5-((2-Acetoxyethyl)(2-chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid '
Bendamustine Deschloro Acetoxy Impurity
BDM53

4-(5-((2-Chloroethyl)(2-ethoxyethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid
Bendamustine Deschloro Ethoxy Impurity
BDM54

4-(5-((2-Chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid
CAS:1219709-86-0
Bendamustine USP RC D (Base) Bendamustine Deschlo
BDM24B

4-(5-((2-CHLOROETHYL)AMINO)-1-METHYL-1H-BENZO[D]IMIDAZOL-2-YL)BUTANOIC ACID ETHYL ESTER
Bendamustine Deschloroethyl Acid Ethyl Ester
BDM32

4-(5-((2-Chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid HCl
CAS:1797881-48-1
Bendamustine USP RC D (HCl) Bendamustine HCl Desc
BDM24H

4-(5-(4-(Bromomethyl)phenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl)benzenesulfonamide
CAS:170570-75-9
Celecoxib Bromo Impurity Dehydroxy Bromocelecoxib
CLC46

4-(5-(4-(HYDROPEROXYMETHYL)PHENYL)-3-(TRIFLUOROMETHYL)-1H-PYRAZOL-1-YL)BENZENESULFONAMIDE
CAS:2247197-65-3
Celecoxib Impurity 17
CLC67

4-(5-(4-(PENTYLOXY)PHENYL)ISOXAZOL-3-YL)BENZOIC ACID
CAS:179162-55-1
Micafungin Side Chain Acid
MCF31

4-(5-(4-(Pentyloxy)phenyl)isoxazol-3-yl)benzoic acid benzotriazole ester
Micafungin Side Chain Acid Benzotriazole Ester
MCF32

4-(5-(4-(Pentyloxy)phenyl)isoxazol-3-yl)benzoic acid methyl ester
CAS:179162-64-2
Micafungin Side Chain Acid Methyl Ester
MCF33

4-(5-(Bis(2-chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid HCl
CAS:3543-75-7
Bendamustine HCl
BDM00H

4-(5-(Bis(2-chloroethyl)amino)-1H-benzo[d]imidazol-2-yl)butanoic acid HCl
CAS:31349-38-9
Bendamustine N-Desmethyl Impurity
BDM30H

4-(5-(Bis(2-hydroxyethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid
CAS:109882-30-6
Bendamustine USP RC A (Base) Bendamustine Dihydro
BDM21B

4-(5-(Bis(2-hydroxyethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid ethyl ester
CAS:3543-74-6
Bendamustine USP RC C Bendamustine Dihydroxy Acid
BDM23B

4-(5-(Bis(2-hydroxyethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid HCl
CAS:109882-29-3
Bendamustine USP RC A (HCl) Bendamustine HCl Dihy
BDM21H

4-(5-(Hydroxymethyl)-3-phenylisoxazol-4-yl)benzenesulfonamide
CAS:181695-81-8
Valdecoxib 1-Hydroxy
VXB51

4-(5-(PYRIDIN-4-YL)-1,3,4-OXADIAZOL-2-YL)PICOLINONITRILE
CAS:2044704-74-5
Topiroxostat Impurity 4
TPX54

4-(5-(PYRIDIN-4-YL)-1H-1,2,4-TRIAZOL-3-YL)PICOLINAMIDE
CAS:1992028-94-0
Topiroxostat Impurity 3
TPX53

4-(5-(Pyridin-4-yl)-1H-1,2,4-triazol-3-yl)picolinic acid
CAS:2044702-36-3
Topiroxostat Impurity 2
TPX52

4-(5-(Pyridin-4-yl)-1H-1,2,4-triazol-3-yl)picolinonitrile
CAS:577778-58-6
Topiroxostat
TPX00

4-(5-(Pyridin-4-yl)-1H-1,2,4-triazol-3-yl)picolinonitrile N-Oxide
CAS:577778-82-6
Topiroxostat Impurity 5
TPX55

4-(5-(Pyridin-4-yl)-2H-1,2,4-triazol-3-yl)pyridine
CAS:4329-78-6
Topiroxostat Impurity 6
TPX56

4-(5-AMINO-1-METHYL-1H-BENZO[D]IMIDAZOL-2-YL)BUTANOIC ACID
CAS:914626-62-3
Bendamustine Dideschloroethyl Acid Impurity
BDM33

4-(5-Amino-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid ethyl ester
CAS:3543-73-5
Bendamustine Dideschloroethyl Acid Ethyl Ester
BDM34

4-(5-AMINO-6-BENZYLPYRAZIN-2-YL)PHENOL
CAS:37156-84-6
Coelenteramine
CTM00

4-(5-Amino-6-benzylpyrazin-2-yl)phenol N-Oxide
CAS:473465-20-2
Coelenteramine N-Oxide
CTM52

4-(5-CHLORO-2-OXO-2,3-DIHYDRO-1H-BENZIMIDAZOL-1-YL)-1-FORMYLPIPERIDINE
CAS:1346598-11-5
Domperidone EP Impurity B
DPD02

4-(5-DIBENZO[A,D]CYCLOHEPTENYLIDENE)PIPERIDINE
CAS:14051-46-8
Cyproheptadine N-Desmethyl Impurity
CHT52

4-(5-Hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-3-methyl-1-phenyl-1H-pyrazol-5-ol
CAS:7477-67-0 177415-76-8
Edaravone Impurity 4 Bispyrazolone
ERV54

4-(5-Hydroxy-3-p-tolyl-5-(trifluoromethyl)-4,5-dihydropyrazol-1-yl)benzenesulfonamide
CAS:1803258-57-2
Celecoxib Impurity 13
CLC63

4-(5-METHYL-3-PHENYLISOXAZOL-4-YL)BENZENE-1-SULFONYL CHLORIDE
CAS:509074-26-4
Valdecoxib Sulfonyl Chloride
VXB54

4-(5-METHYL-3-PHENYLISOXAZOL-4-YL)BENZENESULFONAMIDE
CAS:181695-72-7
Valdecoxib
VXB00

4-(5-METHYL-3-PHENYLISOXAZOL-4-YL)BENZENESULFONIC ACID
CAS:181696-35-5
Valdecoxib Sulfonic Acid
VXB53

4-(5-Nitro-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid ethyl ester
CAS:3543-72-4
Bendamustine Nitro Ethy Ester Impurity
BDM44

4-(5-PHENYL-3-TRIFLUOROMETHYL-1H-PYRAZOL-1-YL)BENZENESULFONAMIDE
CAS:170569-87-6
Celecoxib Desmethyl Impurity
CLC50

4-(5H-DIBENZO[A,D][7]ANNULEN-5-YLIDENE)-1-METHYLPIPERIDINE
CAS:129-03-3
Cyproheptadine
CHT00B

4-(5H-DIBENZO[A,D][7]ANNULEN-5-YLIDENE)-1-METHYLPIPERIDINE HYDROCHLORIDE
CAS:969-33-5 (anhydrous)
Cyproheptadine HCl
CHT00X

4-(5H-DIBENZO[A,D][7]ANNULEN-5-YLIDENE)-1-METHYLPIPERIDINE HYDROCHLORIDE SESQUIHYDRATE
CAS:41354-29-4 (sesquihydrate)
Cyproheptadine HCl Sesquihydrate
CHT00H

4-(5H-Dibenzo[a,d]cyclohepten-5-ylidene)-1-methyl-piperidine 1-Oxide
CAS:100295-63-4
Cyproheptadine N-Oxide
CHT51

4-(6,7-Dimethoxyquinolin-4-yloxy)benzenamine
CAS:190728-25-7
Cabozantinib Impurity 2
CZN52

4-(6,8-DIBROMO-3(4H)-QUINAZOLINYL)-CYCLOHEXANOL
CAS:1797894-71-3
Ambroxol Quinazoline Impurity
AMB32

4-(6-((6-ACETYL-8-CYCLOPENTYL-5-METHYL-7-OXO-7,8-DIHYDROPYRIDO[2,3-D]PYRIMIDIN-2-YL)AMINO)PYRIDIN-3-YL)PIPERAZINE-1-CARBALDEHYDE
CAS:2174002-16-3
Palbociclib N-Formyl Impurity
PBC54B

4-(6-Acetyl-3-(3-(4-acetyl-3-hydroxy-2-propylphenylthio)propoxy)-2-propylphenoxy)butanoic acid
CAS:125961-82-2
Tipelukast
TLK00

4-(6-fluorobenzo[d]isoxazol-3-yl)-1-(2-(2-methyl-4-oxo-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-3-yl)ethyl)piperidine 1-oxide
CAS:1894509-66-0
Risperidone RC 27
RSP97

4-(6-METHOXYNAPHTHALEN-2-YL)BUTAN-2-ONE
CAS:42924-53-8
Nabumetone
NBM00

4-(6-Oxo-1,6-dihydropyrimidin-2-ylamino)benzonitrile
CAS:189956-45-4
Rilpivirine Lactam Impurity
RLP57B

4-(7,9-Dioxo-8-azaspiro[4.5]dec-8-yl)butyl [1-[2-oxo-2-[[4-[4-(pyrimidin-2-yl)piperazin-1-yl]butyl]amino]ethyl]-cyclopentyl]acetate
CAS:2726492-72-2
Buspirone EP Impurity J (Base) Buspirone Open Rin
BPR10B

4-(7,9-Dioxo-8-azaspiro[4.5]dec-8-yl)butyl [1-[2-oxo-2-[[4-[4-(pyrimidin-2-yl)piperazin-1-yl]butyl]amino]ethyl]-cyclopentyl]acetate oxalate
CAS:2726492-73-3
Buspirone EP Impurity J (Oxalate) Buspirone Open
BPR10X

4-(7-(6-Cyano-5-(trifluoromethyl)pyridin-3-yl)-8-oxo-6-thioxo-5,7-diazaspiro[3.4]octan-5-yl)-2-fluoro-N-(3-fluoro-4-(methylcarbamoyl)phenyl)-N-methylbenzamide
CAS:2894796-76-8
Apalutamide RC 1
APD61

4-(7-Chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-1-piperidine carboxylic acid ethyl ester
CAS:1346602-19-4
Loratadine 8-Dechloro-7-Chloro Impurity
LRT87

4-(8-Amino-3-(4-but-2-ynamidobutanoyl)imidazo[1,5-a]pyrazin-1-yl)-N-(pyridin-2-yl)benzamide
CAS:2230757-47-6
Acalabrutinib M27 Acalabrutinib ACP-5862
AAL77

4-(8-Chloro-5,6-dihydro-1-oxido-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-1-piperidinecarboxylic acid ethyl ester
CAS:165739-62-8
Loratadine N-oxide
LRT33

4-(8-Chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-yl)-piperidine
Desloratadine Dihydro Impurity Loratadine Dihydro
DLR32

4-(8-Chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-1-piperidinecarboxaldehyde
CAS:117810-61-4
Loratadine N-Formyl Impurity N-Formyl Desloratadi
LRT12

4-(8-Chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-piperidine
CAS:100643-71-8
Desloratadine Loratadine EP Impurity D Rupatadin
DLR00

4-(8-Chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-piperidine
CAS:100643-71-8
Rupatadine EP Impurity B Desloratadine Loratadin
RPT02B

4-(8-Fluoro-1-oxo-2,3,4,6-tetrahydro-1H-azepino[5,4,3-cd]indol-5-yl)benzamide
Rucaparib Amide Impurity
RCP51

4-(8-Fluoro-1-oxo-2,3,4,6-tetrahydro-1H-azepino[5,4,3-cd]indol-5-yl)benzoic acid
CAS:1577998-89-0
Rucaparib Carboxylic Acid
RCP52

4-(9,10-Dihydro-4-hydroxy-4H-benzo[4,5]cyclohepta[1,2-b]thien-4-yl)-1-methylpiperidine
Pizotifen RC 1
PZT51

4-(9,10-Dihydro-4H-benzo[4,5]cyclohepta[1,2-b]thien-4-ylidene)-1-methylpiperidine
CAS:15574-96-6
Pizotifen Pizotyline
PZT00

4-(9-((2,2,2-Trifluoroethyl)carbamoyl)-9H-fluoren-9-yl)butanoic acid
CAS:182439-11-8
Lomitapide M3
LPD63

4-(9-Chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)-1-piperidine carboxylic acid ethyl ester
CAS:109537-11-3
Loratadine 8-Dechloro-9-Chloro Impurity
LRT89

4-(ACETYLAMINO)-2-HYDROXYBENZOIC ACID
CAS:50-86-2
Metoclopramide EP Impurity H Metoclopramide BP Im
MCA08

4-(ACETYLAMINO)-5-CHLORO-N-[2-(DIETHYLAMINO)ETHYL]-2-METHOXYBENZAMIDE
CAS:5608-13-9
Metoclopramide EP Impurity A Metoclopramide USP R
MCA01

4-(Acetylamino)benzene-1-sulfonic acid
CAS:121-62-0
Sulfadimethoxine EP Impurity C
SDM03

4-(Acetylamino)phenyl (diethylamino)acetate hydrochloride
CAS:66532-86-3
Propacetamol Hydrochloride
PPC00H

4-(ACETYLAMINO)PHENYL ACETATE
CAS:2623-33-8
Paracetamol EP Impurity H Acetaminophen USP RC A
PCM08

4-(Aminocarbonyl)pyridine
CAS:1453-82-3
Isonicotinamide Isoniazid EP Impurity B Nicotina
INM00

4-(Aminocarbonyl)pyridine
CAS:1453-82-3
Isoniazid EP Impurity B Nicotinamide EP Impurity
ISN02

4-(AMINOMETHYL)-1-PHENETHYLPIPERIDIN-4-OL
CAS:23808-42-6
Fenspiride Descarbonyl Impurity
FSR51

4-(Aminomethyl)-6-bromo-5-hydroxy-1,2-dimethyl-1H-indole-3-carbaldehyde
Arbidol Impurity C
ADX53

4-(AMINOMETHYL)BENZENESULFONAMIDE
CAS:138-39-6
Mafenide
MFN00B

4-(Aminomethyl)benzenesulfonamide acetic acid
CAS:13009-99-9
Mafenide Acetate
MFN00A

4-(AMINOMETHYL)BENZENESULFONAMIDE HCL
CAS:138-37-4
Mafenide HCl
MFN00H

4-(AMINOMETHYL)CYCLOHEXANECARBOXYLIC ACID
CAS:701-54-2
Tranexamic Acid Racemate
TNX50

4-(Benzo[b]thiophen-4-yl)-1,1-bis(4-((2-oxo-1,2-dihydroquinolin-7-yl)oxy)butyl)piperazin-1-ium iodide
Brexpiprazole Impurity 15
BRX75

4-(BENZYLOXY)-2-HYDROXYBENZOIC ACID
CAS:5448-45-3
Flecainide RC 1
FCN61

4-(Benzyloxy)-6-bromo-2-methyl-1H-benzo[d]imidazole
CAS:774582-60-4
Tegoprazan RC 9
TGP69

4-(BENZYLOXY)BENZENAMINE
CAS:6373-46-2
Paracetamol RC 2
PCM62

4-(Benzyloxycarbonyl)-2-fluorophenylboronic acid
CAS:874290-59-2
Tedizolid Impurity 4
TDZ64

4-(Biphenyl-4-yl)-4-oxobut-2-enoic acid
Fenbufen EP Impurity B
FBF02

4-(BIPHENYL-4-YL)-4-OXOBUTANOIC ACID
CAS:36330-85-5
Fenbufen
FBF00

4-(BROMOMETHYL)-2-METHYL-1-(TRIFLUOROMETHOXY)BENZENE
CAS:1261679-35-9
Pretomanid Impurity 6
PTD56

4-(BROMOMETHYL)BENZOIC ACID
CAS:6232-88-8
Eprosartan USP RC D
EPS24

4-(BROMOMETHYL)PYRROLIDIN-2-ONE
CAS:945671-51-2
Pregabalin Impurity 4
PRG64

4-(BUTYLAMINO)BENZOIC ACID
CAS:4740-24-3
Tetracaine EP Impurity B Tetracaine USP RC B
TCX02

4-(CARBOXYMETHYL)-2-ETHOXYBENZOIC ACID
CAS:220438-80-2
Repaglinide EP Impurity A
RPG01

4-(Chloromethyl)-N-(3-methyl-4-(4-(pyridin-3-yl)pyrimidin-2-ylamino)phenyl)benzamide
CAS:796738-74-4
Imatinib Impurity 2
IMT52

4-(Chloromethyl)-N-(4-methyl-3-(4-(pyridin-3-yl)pyrimidin-2-ylamino)phenyl)benzamide
CAS:404844-11-7
Imatinib Impurity 9
IMT89

4-(CHLOROMETHYL)PIPERIDINE
CAS:58013-32-4
Efinaconazole RC 1 (Base)
EFC61B

4-(CHLOROMETHYL)PIPERIDINE HYDROCHLORIDE
CAS:1822-61-3
Efinaconazole RC 1 (HCl)
EFC61H

4-(CYCLOPROPYLMETHOXY)-N-(3,5-DICHLOROPYRIDIN-4-YL)-3-(DIFLUOROMETHOXY)BENZAMIDE
CAS:162401-43-6
Roflumilast RC 2
RFM62

4-(D-Glucopyranosylamino)-N-(5-methyl-3-isoxazolyl)-benzenesulfonamide
CAS:119691-75-7
Sulfamethoxazole N4-Glucoside
SMZ54

4-(Dibenzo[b,f][1,4]thiazepin-11-yl)-1,1-bis(2-(2-hydroxyethoxy)ethyl) piperazin-1-ium iodide
Quetiapine EP Impurity Q
QTP17

4-(Dibenzo[b,f][1,4]thiazepin-11-yl)morpholine
CAS:5747-46-6
Quetiapine EP Impurity T
QTP20B

4-(Diethylamino)but-2-yn-1-yl (RS)-(cyclohex-1-en-1-yl)(cyclohexyl)hydroxyacetate
Oxybutynin EP Impurity A (Base)
OXB01B

4-(Diethylamino)but-2-yn-1-yl (RS)-(cyclohex-1-en-1-yl)(cyclohexyl)hydroxyacetate HCl
Oxybutynin EP Impurity A (HCl)
OXB01H

4-(Diethylamino)but-2-ynyl (RS)-2-(cyclohex-3-en-yl)-2-cyclohexyl-2-hydroxyacetate
CAS:1199574-71-4
Oxybutynin EP Impurity A 3-En Isomer (Base)
OXB61B

4-(Diethylamino)but-2-ynyl (RS)-2-(cyclohex-3-en-yl)-2-cyclohexyl-2-hydroxyacetate HCl
Oxybutynin EP Impurity A 3-En Isomer (HCl)
OXB61H

4-(Diethylamino)but-2-ynyl (RS)-2-cyclohexyl-2-hydroxy-2-phenylacetate hydrochloride
CAS:1508-65-2
Oxybutynin HCl Oxybutynin Chloride
OXB00H

4-(DIETHYLAMINO)BUT-2-YNYL 2-HYDROXY-2,2-DIPHENYLACETATE
CAS:14943-53-4
Oxybutynin EP Impurity B (Base) Oxybutynin Diphen
OXB02B

4-(Diethylamino)but-2-ynyl 2-hydroxy-2,2-diphenylacetate HCl
CAS:95133-28-1
Oxybutynin EP Impurity B (HCl) Oxybutynin Dipheny
OXB02H

4-(DIFLUOROMETHOXY)-3-HYDROXYBENZOIC ACID
CAS:913985-07-6
Roflumilast RC 4
RFM64

4-(Difluoromethoxy)-3-hydroxybenzoyl chloride
CAS:1401228-67-8
Roflumilast RC 3
RFM63

4-(DIMETHYLAMINO)-1,4,4A,5,5A,6,11,12A-OCTAHYDRO-3,10,12,12A-TETRAHYDROXY-1,11-DIOXO-2-NAPHTHACENECARBOXAMIDE
CAS:808-26-4
Sancycline
SCC00

4-(Dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-1,11-dioxo-,[4S-(4a,4aa,5aa,6�,?2aa)]-2-naphthacenecarboxamide
CAS:987-02-0
Tetracycline 6-Desmethyl Impurity Demethyltetracy
TCY56H

4-(Dimethylamino)-1-[(1RS)-1-[3- (dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-2- benzofuran-5-yl]butan-1-one
CAS:1329745-98-3
Citalopram EP Impurity G (Base) EsCitalopram EP I
CTL07B

4-(Dimethylamino)-1-[(1RS)-1-[3- (dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-2- benzofuran-5-yl]butan-1-one
CAS:1329745-98-3
EsCitalopram EP Impurity G (Base) Citalopram EP I
ECT07B

4-(Dimethylamino)-1-[(1RS)-1-[3- (dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-2- benzofuran-5-yl]butan-1-one oxalate
EsCitalopram EP Impurity G (Oxalate) Citalopram E
ECT07X

4-(Dimethylamino)-1-[(1RS)-1-[3- (dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-2- benzofuran-5-yl]butan-1-one oxalate salt
Citalopram EP Impurity G (Oxalate) EsCitalopram E
CTL07X

4-(DIMETHYLAMINO)PYRIDINE
CAS:1122-58-3
Valaciclovir EP Impurity G Valaciclovir USP RC G
VAC07

4-(DIMETHYLSULFAMOYL)BENZOIC ACID
CAS:1206-37-7
Probenecid Dimethyl Analog
PBN54

4-(DIPHENYLMETHOXY)PIPERIDINE
CAS:58258-01-8
Ebastine EP Impurity C (Base) Desalkyl Ebastine
EBN03B

4-(Diphenylmethoxy)piperidine HCl
CAS:65214-86-0
Ebastine EP Impurity C (HCl) Desalkyl Ebastine HC
EBN03H

4-(Dipropylsulfamoyl)-N,N-dipropylbenzamide
Probenecid EP Impurity C
PBN03

4-(Dipropylsulfamoyl)benzamide
CAS:122630-56-2
Probenecid Amide
PBN55

4-(DIPROPYLSULFAMOYL)BENZOIC ACID
CAS:57-66-9
Probenecid
PBN00

4-(Ethyl(1-(4-hydroxyphenyl)propan-2-yl)amino)butanoic acid
CAS:586357-02-0
Mebeverine Acid O-Desmethyl
MBV54

4-(Ethyl(1-(4-methoxyphenyl)propan-2-yl)amino)butan-1-ol
CAS:14367-47-6
Mebeverine EP Impurity C
MBV03

4-(Ethyl(1-(4-methoxyphenyl)propan-2-yl)amino)butanoic acid
CAS:475203-77-1
Mebeverine acid
MBV50

4-(Ethylamino)-6-(isopropylamino)-1,3,5-triazin-2-ol
CAS:2163-68-0
Atrazine Hydroxy Impurity
ARZ54

4-(ETHYLAMINO)BUT-2-YNYL 2-CYCLOHEXYL-2-HYDROXY-2-PHENYLACETATE
CAS:80976-67-6
Oxybutynin N-Desethyl Impurity (Base)
OXB51B

4-(Ethylamino)but-2-ynyl 2-cyclohexyl-2-hydroxy-2-phenylacetate hydrochloride
CAS:81039-77-2
Oxybutynin N-Desethyl Impurity (HCl)
OXB51H

4-(Ethylmethylamino)but-2-ynyl (RS)-2-cyclohexyl-2-hydroxy-2-phenylacetate
CAS:1199574-70-3
Oxybutynin EP Impurity C (Base) Oxybutynin USP RC
OXB03B

4-(Ethylmethylamino)but-2-ynyl (RS)-2-cyclohexyl-2-hydroxy-2-phenylacetate HCl
Oxybutynin EP Impurity C (HCl) Oxybutynin USP RC
OXB03H

4-(Ethylpropylamino)but-2-ynyl (RS)-2-cyclohexyl-2-hydroxy-2-phenylacetate
CAS:1215677-72-7
Oxybutynin EP Impurity E (Base) Oxybutynin Ethylp
OXB05B

4-(Ethylpropylamino)but-2-ynyl (RS)-2-cyclohexyl-2-hydroxy-2-phenylacetate HCl
Oxybutynin EP Impurity E (HCl) Oxybutynin HCl Eth
OXB05H

4-(Formylamino)-1,5-dimethyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-one
CAS:1672-58-8
Metamizole EP Impurity A 4-Formylamino Antipyrine
MMZ01

4-(Hydroxy(methyl)phosphinyl)-butanoic acid
CAS:74265-32-0
Glufosinate Desamino Impurity
GFN50A

4-(HYDROXYAMINO)-N-(5-METHYL-3-ISOXAZOLYL)-BENZENESULFONAMIDE
CAS:114438-33-4
Sulfamethoxazole N-Hydroxy Impurity Sulfamethoxaz
SMZ55

4-(HYDROXYMETHYL)BENZOIC ACID
CAS:3006-96-0
Eprosartan USP RC E
EPS25

4-(Isoquinolin-5-ylsulfonyl)-1,4-diazepan-1-ol
CAS:1350827-92-7
Fasudil N-Hydroxy
FDL51

4-(METHYL{3-PHENYL-3-[4-(TRIFLUOROMETHYL)PHENOXY]PROPYL}AMINO)-4-OXOBUTANOIC ACID
CAS:1026723-45-4
Fluoxetine USP RC C Fluoxetine Succinamic Acid
FXT23

4-(METHYLAMINO)-1-(PYRIDIN-3-YL)BUTAN-1-ONE
CAS:2055-23-4
Nicotine RC 1 (Base)
NTN61B

4-(METHYLAMINO)-1-(PYRIDIN-3-YL)BUTAN-1-ONE DIHYDROCHLORIDE
CAS:66093-90-1
Nicotine RC 1 (2HCl)
NTN61H

4-(Methylsulfinyloxy)butyl methanesulfonate
CAS:1797106-48-9
Busulfan Methylsulfinyloxy Analog
BUF53

4-(Methylsulfonyl)-phenyl acetic acid
CAS:90536-66-6
Etoricoxib USP RC B
ECX22

4-(METHYLSULFONYL)ACETOPHENONE
CAS:10297-73-1
Etoricoxib USP RC A
ECX21

4-(Methylsulfonyloxy)butyl 4-(methylsulfonyloxy)butane-1-sulfonate
Busulfan Methylsulfonyloxybutyl Analog
BUF54

4-(Methylsulfonyloxy)butyl acetate
CAS:19859-00-8
Busulfan O-Acetyl Analog
BUF55

4-(Methylsulfonyloxy)butyl methanesulfonate
CAS:55-98-1
Busulfan
BUF00

4-(Morpholin-4-yl)-1,2,5-thiadiazol-3(2H)-one 1-oxide
CAS:75202-36-7
Timolol EP Impurity G (Base) Timolol BP Impurity
TML07B

4-(Morpholin-4-yl)-1,2,5-thiadiazol-3(2H)-one 1-oxide potassium salt
CAS:79844-78-3
Timolol EP Impurity G (Potassium) Timolol BP Impu
TML07K

4-(MORPHOLIN-4-YL)-1,2,5-THIADIAZOL-3-OL
CAS:30165-97-0
Timolol EP Impurity D Timolol BP Impurity D Timo
TML04B

4-(N,N-DIMETHYLAMINO)BUTANAL DIMETHYL ACETAL
CAS:19718-92-4
Sumatriptan Dimethylamino Impurity
SMT15

4-(N-(1-(4-Cyano-3-(trifluoromethyl)phenylamino)-2-methyl-1-oxopropan-2-yl)formamido)-2-fluorobenzamide
Enzalutamide Impurity 16
EZL76

4-(N-(4-Cyclohexylbenzyl)-2-(N,2,4,6-tetramethylphenylsulfonamido)acetamido)-N-(2-(2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-4-ylamino)ethyl)-2-hydroxybenzamide
Lenalidomide Impurity 11
LLM71

4-(N-(4-Cyclohexylbenzyl)-2-(N,2,4,6-tetramethylphenylsulfonamido)acetamido)-N-(3-(2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-4-ylamino)-3-oxopropyl)-2-hydroxybenzamide
Lenalidomide Impurity 13
LLM73

4-(N-(4-Cyclohexylbenzyl)-2-(N,2,4,6-tetramethylphenylsulfonamido)acetamido)-N-(3-(2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-4-ylamino)propyl)-2-hydroxybenzamide
Lenalidomide Impurity 14
LLM74

4-(N-(4-Cyclohexylbenzyl)-2-(N,2,4,6-tetramethylphenylsulfonamido)acetamido)-N-(6-(2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-4-ylamino)-6-oxohexyl)-2-hydroxybenzamide
Lenalidomide Impurity 9
LLM69

4-(OXIRAN-2-YLMETHOXY)-9-(OXIRAN-2-YLMETHYL)-9H-CARBAZOLE
CAS:1198090-71-9
Carvedilol RC 2
CVD62

4-(PHENYLSULFONYL)BENZENE-1,3-DIAMINE
CAS:116435-84-8
Dapsone RC 5
DPS65B

4-(Prop-1-en-2-yl)-2-propyl-1-[[2�-(1H-tetrazol-5-yl) biphenyl-4-yl] methyl]-1H-imidazole-5-carboxylic acid
CAS:172875-98-8
Olmesartan Anhydro Acid Dehydro Olmesartan Olmes
OLM33

4-(Prop-1-en-2-yl)-2-propyl-1-[[2�-(1H-tetrazol-5-yl) biphenyl-4-yl] methyl]-1H-imidazole-5-carboxylic acid ethyl ester
CAS:172875-87-5
Olmesartan Anhydro Acid Ethyl Ester Olmesartan Me
OLM43

4-(Prop-1-en-2-yl)-2-propyl-1-[[2�-(2-trityl-2H-tetrazol-5-yl) biphenyl-4-yl] methyl]-1H-imidazole-5-carboxylic acid
CAS:1797891-24-7
Olmesartan N2-Trityl Anhydro Acid N2-Trityl Olmes
OLM44

4-(Prop-1-en-2-yl)-2-propyl-1-[[2�-(2-trityl-2H-tetrazol-5-yl) biphenyl-4-yl] methyl]-1H-imidazole-5-carboxylic acid ethyl ester
CAS:172875-70-6
Olmesartan Anhydro Acid N2-Trityl Ethyl Ester Olm
OLM53

4-(PROPYLTHIO)BENZENE-1,2-DIAMINE
CAS:66608-52-4
Albendazole Impurity 1
ABD71

4-(PYRIDIN-2-YL)BENZALDEHYDE
CAS:127406-56-8
Atazanavir EP Impurity B
ATZ02

4-(PYRIDIN-2-YL)BENZOIC ACID
CAS:4385-62-0
Atazanavir EP Impurity A
ATZ01

4-(Pyrrolidin-1-yl)-1-(2,4,6-trimethoxyphenyl)butan-1-one
CAS:55837-25-7
Buflomedil
BFM00B

4-(Pyrrolidin-1-yl)-1-(2,4,6-trimethoxyphenyl)butan-1-one hydrochloride
CAS:35543-24-9
Buflomedil HCl
BFM00H

4-(Pyrrolidin-1-yl)-1-(2,4,6-trimethoxyphenyl)butan-1-one N-oxide hydrochloride
Buflomedil N-Oxide
BFM50H

4-(Pyrrolidin-1-yl)dibenzo[b,d]furan-2-carboxylic acid
Piretanide EP Impurity C
PRT03

4-(t-Butyloxycarbonylmethylaminomethyl)-cyclohexanoic acid
CAS:165947-29-5
Tranexamic Acid RC 2
TNX52

4-(TERT-BUTYL)-N-[6-CHLORO-5-(2-METHOXYPHENOXY)-(2,2'-BIPYRIMIDIN)-4-YL] BENZENESULFONAMIDE
CAS:150727-06-3
Bosentan USP RC A
BSN21

4-(TERT-BUTYL)-N-[6-HYDROXY-5-(2-METHOXYPHENOXY)-(2,2'-BIPYRIMIDIN)-4-YL]BENZENESULFONAMIDE
CAS:174227-14-6
Bosentan USP RC B
BSN22

4-(TERT-BUTYL)BENZENESULFONAMIDE
CAS:6292-59-7
Bosentan USP RC E
BSN25

4-(Trichloromethyl)benzenecarbonitrile
CAS:2179-45-5
Betrixaban 4-Trichloromethylbenzonitrile Impurity
BTB64

4-(Trifluoromethoxy)-2-benzothiazolamine
CAS:235101-36-7
Riluzole 4-Trifluoromethoxy Isomer
RLZ64

4-(TRIFLUOROMETHOXY)BENZALDEHYDE
CAS:659-28-9
Pretomanid Impurity 3
PTD53

4-(TRIFLUOROMETHOXY)BENZYL CHLORIDE
CAS:65796-00-1
Pretomanid Impurity 2
PTD52

4-(TRIFLUOROMETHYL)ANILINE
CAS:455-14-1
Leflunomide EP Impurity A Leflunomide USP RC A
LFM01

4-(TRIFLUOROMETHYL)BENZENEPROPANAMINE
CAS:101488-60-2
Cinacalcet 4-TFM Amine Impurity (Base)
CCC55B

4-(Trifluoromethyl)benzenepropanamine HCl
Cinacalcet 4-TFM Amine Impurity (HCl)
CCC55H

4-(TRIFLUOROMETHYL)BENZENEPROPANOL
CAS:180635-74-9
Cinacalcet 4-TFM Alcohol Impurity
CCC54

4-(TRIFLUOROMETHYL)PHENOL
CAS:402-45-9
Fluoxetine RC 4
FXT64

4-?[(2,?3-?DIHYDRO-?5,?6-?DIMETHOXY-?1-?OXO-?1H-?INDEN-?2-?YL)?CARBONYL]?-?1-?(PHENYLMETHYL)?-PYRIDINIUM CHLORIDE
CAS:923571-16-8
Donepezil Impurity 2
DNP62

4-?[3-?[4-?CYANO-?3-?(TRIFLUOROMETHYL)?PHENYL]?-?5,?5-?DIMETHYL-?4-?OXO-?2-?THIOXO-?1-?IMIDAZOLIDINYL]?-?2-?FLUOROBENZAMIDE
CAS:1242137-16-1
Enzalutamide N-Desmethyl Impurity
EZL52

4-[((2R)-HYDROXY-3-PHTHALIMIDO)PROPYLAMINE]PHENYL-3-MORPHOLINONE
CAS:446292-07-5
Rivaroxaban Phthalimido Descarbonyl Impurity
RVR47

4-[((2RS)-2-Hydroxy-3-(isopropylamino)-propyl)oxy]benzaldehyde
CAS:29122-74-5
Bisoprolol EP Impurity L (Base) Metoprolol EP Imp
BSP12B

4-[((2RS)-2-HYDROXY-3-(ISOPROPYLAMINO)-PROPYL)OXY]BENZALDEHYDE HYDROCHLORIDE
CAS:1956321-87-1
Bisoprolol EP Impurity L (HCl) Metoprolol EP Impu
BSP12H

4-[(1,2,3,4-Tetrahydro-2-oxo-7-quinolinyl)oxy]-butanoic acid
CAS:58899-27-7
Aripiprazole Butanoic Acid Impurity
ARP48

4-[(11RS)-8-chloro-11-fluoro-6,11-dihydro-5H-benzo [5,6] cyclohepta [1,2-b]pyridin-11-yl]piperidine
CAS:298220-99-2
Desloratadine EP Impurity A (Base) 11-Fluoro Dihy
DLR01B

4-[(11RS)-8-chloro-11-fluoro-6,11-dihydro-5H-benzo [5,6] cyclohepta [1,2-b]pyridin-11-yl]piperidine diformate salt
Desloratadine EP Impurity A (Diformate) 11-Fluoro
DLR01F

4-[(11�,17-Dihydroxy-3,20-dioxopregna-1,4-dien-21-yl)oxy]-4-oxobutanoic acid
CAS:2920-86-7
Methylprednisolone Hydrogen Succinate EP Impurity
MHS05

4-[(11�,17-Dihydroxy-6a-methyl-3,20-dioxopregn-4-en-21-yl)oxy]-4-oxobutanoic acid
CAS:119657-85-1
Methylprednisolone Hydrogen Succinate EP Impurity
MHS04

4-[(11�,17-Dihydroxy-6a-methyl-3,20-dioxopregna-1,4-dien-21-yl)oxy]-4-oxobutanoic acid
CAS:2921-57-5
Methylprednisolone Hydrogen Succinate 6a-Methylpr
MHS00A

4-[(11�,17-Dihydroxy-6a-methyl-3,20-dioxopregna-1,4-dien-21-yl)oxy]-4-oxobutanoic acid sodium salt
CAS:3/3/2375
Methylprednisolone Hydrogen Succinate (Sodium) 6a
MHS00N

4-[(11�,17-Dihydroxy-6�-methyl-3,20-dioxopregna-1,4-dien-21-yl)oxy]-4-oxobutanoic acid
Methylprednisolone Hydrogen Succinate EP Impurity
MHS06

4-[(11�,21-Dihydroxy-6a-methyl-3,20-dioxopregna-1,4-dien-17-yl)oxy]-4-oxobutanoic acid
CAS:77074-42-1
Methylprednisolone Hydrogen Succinate EP Impurity
MHS02

4-[(1R)-2-(Benzylmethylamino)-1-hydroxyethyl]benzene-1,2-diol (R)-4-(2-(benzyl(methyl)amino)-1-hydroxyethyl)benzene-1,2-diol
CAS:317351-40-9
Adrenaline EP Impurity D
ADZ04

4-[(1RS)-1-Hydroxy-2-(methylamino)ethyl]-1,2-phenylene bis(2,2-dimethylpropanoate) hydrochloride
CAS:64019-93-8
Dipivefrine Hydrochloride
DPV00H

4-[(1RS)-2,2-Dichlorocyclopropyl]phenol
CAS:52179-26-7
Ciprofibrate EP Impurity B
CRF02

4-[(1RS)-2-(Ethylmethylamino)-1-hydroxyethyl]-1,2-phenylene bis(2,2-dimethylpropanoate)
Dipivefrine EP Impurity F
DPV06

4-[(1RS)-3-(METHYLAMINO)-1-(THIOPHEN-2-YL)PROPYL]NAPHTHALEN-1-OL
CAS:949095-98-1
Duloxetine EP Impurity C (Base)
DLX03B

4-[(1RS)-3-(Methylamino)-1-(thiophen-2-yl)propyl]naphthalen-1-ol HBr
CAS:949096-01-9
Duloxetine EP Impurity C (HBr)
DLX03X

4-[(1RS)-3-(Methylamino)-1-(thiophen-2-yl)propyl]naphthalen-1-ol HCl
CAS:953028-76-7
Duloxetine EP Impurity C (HCl)
DLX03H

4-[(1Z)-4-(Dimethylamino)-1-(4-fluorophenyl)but-1-en-1-yl]-3-(hydroxy methyl)benzonitrile
CAS:1370643-22-3
EsCitalopram EP Impurity I (Base)
ECT09B

4-[(1Z)-4-(Dimethylamino)-1-(4-fluorophenyl)but-1-en-1-yl]-3-(hydroxy methyl)benzonitrile oxalate
EsCitalopram EP Impurity I (Oxalate)
ECT09X

4-[(1Z)-4-CHLORO-1-[4-(2-HYDROXYETHOXY)PHENYL]-2-PHENYL-1-BUTENYL]-PHENOL
CAS:128585-01-3
Ospemifene 4-Hydroxy Impurity
OPF51

4-[(2,3-DIMETHYLCYCLOHEXYL)METHYL]-1H-IMIDAZOLE
CAS:2408662-26-8
Detomidine EP Impurity C
DTM03

4-[(2,3-Dimethylphenyl)methyl]-1H-imidazole
CAS:76631-46-4
Detomidine (Base)
DTM00B

4-[(2,3-dimethylphenyl)methyl]-1H-imidazole hydrochloride
CAS:90038-01-0
Detomidine (HCl) Detomidine Hydrochloride
DTM00H

4-[(2,4-Dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1-piperazinyl)propoxy]-3-quinolinecarbonitrile
CAS:380843-75-4
Bosutinib
BST00

4-[(2-Bromo-4,5-dimethoxyphenyl)methyl]-4-[2-[2-(6,6-dimethylbicyclo[3.1.1]-hept-2-yl)ethoxy]ethyl]morpholinium bromide
CAS:53251-94-8
Pinaverium bromide
PVB00

4-[(2-Chloroethyl)(2-ethoxyethyl)amino]-L-phenylalanine
Melphalan EP Impurity E
MLP05

4-[(2-Chloroethyl)(2-hydroxyethyl)amino]-L-phenylalanine
CAS:61733-01-5
Melphalan EP Impurity D Hydroxy Melphalan
MLP04

4-[(2-Chloroethyl)(2-methoxyethyl)amino]-L-phenylalanine dihydrochloride
Melphalan EP Impurity I Methoxy Dechloro Melphala
MLP09H

4-[(2-CHLOROETHYL)AMINO]-L-PHENYLALANINE
CAS:573704-41-3
Melphalan EP Impurity C (Base)
MLP03B

4-[(2-CHLOROETHYL)AMINO]-L-PHENYLALANINE DIHYDROCHLORIDE
CAS:896715-19-8
Melphalan EP Impurity C (2HCl)
MLP03H

4-[(2-ISOPROPOXYETHOXY)METHYL]PHENOL
CAS:177034-57-0
Bisoprolol EP Impurity M
BSP13

4-[(2RS)-2-Hydroxy-3-[(1-methylethyl)amino]propoxy]benzaldehyde
CAS:29122-74-5
Metoprolol EP Impurity C (Base) Metoprolol USP RC
MTP03B

4-[(2RS)-2-Hydroxy-3-[(1-methylethyl)amino]propoxy]benzaldehyde maleate salt
Metoprolol EP Impurity C (Maleate) Metoprolol USP
MTP03M

4-[(2S,3R)-1-(4-Fluorophenyl)-3-[(3S)-3-(4-fluorophenyl)-3-hydroxypropyl]-4-oxo-2-azetidinyl]phenyl �-D-glucopyranosiduronic acid
CAS:190448-57-8
Ezetimibe Phenoxy �-D-Glucuronide
EZT70

4-[(3,5-Dichloro-4-methoxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1-piperazinyl)propoxy]-3-quinolinecarbonitrile methanoate
Bosutinib Impurity 32 (Methanoate)
BST92M

4-[(3-CHLORO-4-FLUOROPHENYL)AMINO]-6-[3-(4-MORPHOLINYL)PROPOXY]-7-QUINAZOLINOL
CAS:847949-49-9
Gefitinib O-Desmethyl Impurity
GFT52

4-[(3-Chloro-4-fluorophenyl)amino]-7-methoxy-6-quinazolinol
CAS:184475-71-6
Gefitinib O-Desmorpholinopropyl Impurity
GFT53

4-[(3-METHYLPHENYL)AMINO]-3-PYRIDINESULFONAMIDE
CAS:72811-73-5
Torsemide EP Impurity B Torsemide USP RC A
TSM02

4-[(3aS,4S,6aR)-2-Oxohexahydrothieno[3,4-d]imidazol-4-yl]butane-1,1-dicarboxylic acid
CAS:57671-79-1
Biotin EP Impurity B Biotin Diacid
BTN02

4-[(3R,5S)-5-([1,1'-Biphenyl]-4-ylmethyl)-3-methyl-2-oxopyrrolidin-1-yl]-4-oxobutanoic acid
Sacubitril RC 9
SCT79

4-[(4-Aminohex-5-enoyl)amino]hex-5-enoic acid
CAS:794466-81-2
Vigabatrin EP Impurity F
VGB06B

4-[(4-Bromo-2-fluorophenyl)amino]-7-[(1-methyl-4-piperidinyl)methoxy]-6-quinazolinol
CAS:910298-60-1
Vandetanib O-Desmethyl Impurity
VDT53

4-[(4-BROMOPHENYL)-1H-1,2,4-TRIAZOL-1-YLMETHYL]BENZONITRILE
CAS:143030-54-0
Letrozole 4-Descyano 4-Bromo Impurity
LTZ54

4-[(4-Butyl-3,5-dioxo-1,2-diphenylpyrazolidin-4-yl)methoxy]-4-oxobutanoic acid
CAS:27470-51-5
Suxibuzone
SXB00

4-[(4-Chlorophenyl)methyl]-2-(hexahydro-1-methyl-1-oxido-1H-azepin-4-yl)-1(2H)-phthalazinone
CAS:640279-88-5
Azelastine N-Oxide Azelastine RC F
AZN50

4-[(4-Hydroxy-3-methylphenyl)amino]-N-[[(1-methylethyl)amino]carbonyl]-3-pyridinesulfonamide
CAS:99300-67-1
Torsemide 4-Hydroxy Impurity
TSM54

4-[(4-Hydroxylaminophenyl)sulfonyl]phenylamine
CAS:32695-27-5
Dapsone N-Hydroxy Impurity Monohydroxy Dapsone
DPS59B

4-[(4-Hydroxyphenyl)-2-pyridinylmethyl]phenyl �-D-Glucopyranosiduronic Acid
CAS:31050-47-2
Bisacodyl Desacetyl �-D-Glucuronide
BSC50

4-[(4-METHYL-1,4-DIOXIDO-1-PIPERAZINYL)METHYL]-N-[4-METHYL-3-[[4-(3-PYRIDINYL)-2-PYRIMIDINYL]AMINO]PHENYL]BENZAMIDE
CAS:571186-93-1
Imatinib Piperazine-N,N-DiOxide
IMT72

4-[(4-Methyl-1-piperazinyl)methyl]-N-[3-methyl-4-[[4-(3-pyridinyl)-2-pyrimidinyl] amino]phenyl]benzamide HCl
CAS:1026753-54-7
Imatinib para-PPA Impurity (HCl)
IMT78H

4-[(4-Methylpiperazin-1-yl)methyl]-N-(4-methyl-3-{[4-(pyridin-3-yl)pyrimidin-2-yl]-N-acetyl-amino}phenyl)benzamide
CAS:1321600-78-5
Imatinib N-Acetyl Impurity
IMT60

4-[(4-Methylpiperazin-1-yl)methyl]-N-(4-methyl-3-{[4-(pyridin-3-yl)pyrimidin-2-yl]amino}phenyl)benzamide mesylate salt
CAS:220127-57-1
Imatinib mesylate
IMT00M

4-[(5,6-Dimethoxy-1-oxo-1H-inden-2-yl)methyl]pyridine 1-oxide 5,6-Dimethoxy-2-(1-oxido-pyridin-4-ylmethylene)indan-1-one
CAS:896134-06-8
Donepezil Alkene Pyridine N-Oxide (USP) Donepezil
DNP48

4-[(5,6-Dimethoxyindan-2-yl)methyl] piperidine
CAS:844694-83-3
Donepezil Desbenzyl Deoxy Impurity (Base) Deoxy D
DNP44B

4-[(5,6-Dimethoxyindan-2-yl)methyl] piperidine HCl
CAS:1034439-43-4
Donepezil Desbenzyl Deoxy Impurity (HCl) Deoxy De
DNP44H

4-[(5-Amino-1-methyl-1H-indol-3-yl)methyl]-3-methoxy-N-[(2-methylphenyl) sulfonyl]benzamide
CAS:219583-10-5
Zafirlukast M1 Metabolite Zafirlukast Amino Sulfo
ZFL71

4-[(6-Methoxy-8-quinolinyl)amino]pentanoic acid
CAS:77229-68-6
Primaquine Carboxy Impurity
PMQ50

4-[(7-CHLORO-4-QUINOLINYL)AMINO]-2-[(DIETHYLAMINO)METHYL]PHENOL
CAS:86-42-0
Amodiaquine (Base)
ADQ00B

4-[(7-Chloro-4-quinolinyl)amino]-2-[(diethylamino)methyl]phenol dihydrochloride dihydrate
CAS:6398-98-7
Amodiaquine (2HCl Dihydrate) Amodiaquine Dihydroc
ADQ00H

4-[(7-Chloro-4-quinolinyl)amino]-2-[(ethylamino)methyl]phenol
CAS:79352-78-6
Amodiaquine N-Desethyl (Base) N-Desethyl Amodiaqu
ADQ50B

4-[(7-Chloro-4-quinolinyl)amino]-2-[(ethylamino)methyl]phenol dihydrochloride
CAS:79049-30-2
Amodiaquine N-Desethyl (2HCl) N-Desethyl Amodiaqu
ADQ50X

4-[(7-Chloro-4-quinolinyl)amino]-2-[(ethylamino)methyl]phenol monohydrochloride
CAS:1246819-11-3
Amodiaquine N-Desethyl (HCl) N-Desethyl Amodiaqui
ADQ50H

4-[(DIPROPYLAMINO)SULFONYL]-2-NITROBENZOIC ACID
CAS:2577-52-8
Probenecid 2-Nitro
PBN56

4-[(Dipropylamino)sulfonyl]-N-methylbenzamide
CAS:923135-96-0
Probenecid RC 1
PBN61

4-[(Dipropylamino)sulfonyl]benzoic acid 1-methylethyl ester
CAS:70190-78-2
Probenecid Isopropyl Ester
PBN53

4-[(DIPROPYLAMINO)SULFONYL]BENZOIC ACID METHYL ESTER
CAS:53212-75-2
Probenecid Methyl Ester
PBN51

4-[(Methylamino)acetyl]-1,2-phenylene bis(2,2-dimethylpropanoate)
CAS:52245-00-8
Dipivefrine EP Impurity E Adrenalone Dipavalate E
DPV05

4-[(RaSa)-1-Methylpiperidin-4-ylidene]-4,9-dihydro-10H-benzo[4,5]cyclohepta[1,2-b]thiophen-10-one N-oxide
CAS:88456-70-6
Ketotifen EP Impurity D (Base) Ketotifen N-Oxide
KTT04B

4-[(RaSa)-1-Methylpiperidin-4-ylidene]-4,9-dihydro-10H-benzo[4,5]cyclohepta[1,2-b]thiophen-10-one N-oxide HCl
CAS:59743-91-8
Ketotifen EP Impurity D (HCl) Ketotifen N-Oxide H
KTT04H

4-[(RS)-(4-Hydroxyphenyl)(pyridin-2-yl)methyl]phenyl Acetate
CAS:72901-16-7
Bisacodyl EP Impurity C Bisacodyl USP RC C Mono-
BSC03

4-[(RS)-(4-Hydroxyphenyl)(pyridin-2-yl)methyl]phenylsulfate sodium salt
CAS:32500-19-9
Picosulfate EP Impurity A (Sodium) Picosulfate US
PCS01N

4-[(RS)-(4-Hydroxyphenyl)(pyridin-2-yl)methyl]phenylsulfuric acid
CAS:51264-33-6
Picosulfate EP Impurity A (Acid) Picosulfate USP
PCS01A

4-[(RS)-(Biphenyl-4-yl)phenylmethyl]-1H-imidazole
CAS:91679-37-7
Bifonazole EP Impurity B
BFN02

4-[-((-((4-(5-(Bis(2-Chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoyl)oxy)ethyl)(2-chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid
CAS:1228551-91-4
Bendamustine USP RC H (Base) Bendamustine Trichlo
BDM28B

4-[-((-((4-(5-(Bis(2-Chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoyl)oxy)ethyl)(2-chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid HCl
Bendamustine USP RC H (HCl) Bendamustine HCl Tric
BDM28H

4-[-((-((4-(5-(Bis(2-hydroxyethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoyl)oxy)ethyl)(2-hydroxyethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid
CAS:1391052-61-1
Bendamustine Trihydroxyethyl Dimer Impurity Benda
BDM43

4-[[(1,4-Dihydro-4-oxo-3-quinolinyl)carbonyl]amino]-5-(1,1-dimethylethyl)-2-hydroxy-a,a-dimethylbenzeneacetic Acid
CAS:1246213-24-0
Ivacaftor Carboxylic Acid Impurity
IVC51

4-[[(1S)-1-CARBOXY-2-(4-HYDROXYPHENYL)ETHYL]AMINO]-4-OXOBUTANOIC ACID
CAS:374816-32-7
Clavulanate Potassium EP Impurity G N-(Hydrogensu
CVL07

4-[[(2-Amino-4-hydroxypteridin-6-yl)methyl]amino]benzoic acid
CAS:119-24-4
Methotrexate EP Impurity D Desmethyl Impurity Fol
MTX54

4-[[(2-Amino-4-hydroxypteridin-6-yl)methyl]methylamino]benzoic acid N10-Methylpteroic Acid
CAS:5623-18-7
Methotrexate EP Impurity D
MTX04

4-[[(2-Amino-4-oxo-1,4-dihydropteridin-6-yl)methyl]amino]benzoic acid
CAS:119-24-4
Folic Acid EP Impurity D Pteroic Acid Methotrexa
FCD04

4-[[(2R,3R,4R,5S,6R)-3,4-Dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]amino]-1H-imidazole-5-carboxamide
Temozolomide RC 7 5-Aminoimidazole-4-Carboxamide
TMZ67

4-[[(2RS)-1-[4-[4-[(3,4-Dimethoxybenzoyl)oxy]butoxy]phenyl]propan-2-yl](ethyl)amino]butyl-3,4-dimethoxybenzoate
Mebeverine EP Impurity G
MBV07

4-[[(2S)-8-(Dimethylamino)-6-[[2-[(1,1-dimethylethyl)amino]acetyl]amino]-1,2,3,4-tetrahydro-5-hydroxy-4-oxo-2-naphthalenyl]methyl]-2,5-dihydroxy-3,6-dioxo-1,4-cyclohexadiene-1-carboxamide
CAS:1268494-46-7
Tigecycline Quinone Impurity (Base)
TGC56B

4-[[(2S)-8-(Dimethylamino)-6-[[2-[(1,1-dimethylethyl)amino]acetyl]amino]-1,2,3,4-tetrahydro-5-hydroxy-4-oxo-2-naphthalenyl]methyl]-2,5-dihydroxy-3,6-dioxo-1,4-cyclohexadiene-1-carboxamide trifluoroacetic acid salt
Tigecycline Quinone Impurity (TFA Salt)
TGC56T

4-[[(4-Aminophenyl)sulfonyl]amino]N-(5-methylisoxazol-3-yl)benzenesulfonamide
CAS:135529-16-7
Sulfamethoxazole EP Impurity B Sulfamethoxazole U
SMZ02

4-[[(T-BUTOXYCARBONYL)AMINO]METHYL]CYCLOHEXANECARBOXYLIC ACID
CAS:162046-58-4
Tranexamic Acid RC 3
TNX53

4-[[[(4-Fluorophenyl)methyl]amino]carbonyl]-1,6-dihydro-1-methyl-2-[1-methyl-1-[[(5-methyl-1,3,4-oxadiazol-2-yl)carbonyl]amino]ethyl]-6-oxopyrimidin-5-yl �-D-glucopyranosiduronic acid
CAS:952654-62-5
Raltegravir �-D-Glucuronide
RGV50

4-[[[(4-Fluorophenyl)methyl]amino]carbonyl]-1,6-dihydro-1-methyl-2-[1-methyl-1-[[(5-methyl-1,3,4-oxadiazol-2-yl)carbonyl]amino]ethyl]-6-oxopyrimidin-5-yl �-D-glucopyranosiduronic acid methyl ester
Raltegravir �-D-Glucuronide Methyl Ester
RGV51

4-[[[(Butylamino)carbonyl]amino]sulfonyl]benzoic acid
CAS:2224-10-4
Tolbutamide 4-Carboxy
TBM50

4-[[[[(Hexahydrocyclopenta[c]pyrrol-2(1H)-yl)amino]carbonyl]amino]sulfonyl]benzoic acid
CAS:38173-52-3
Gliclazide Carboxy
GCZ53

4-[[[[4-(2-Hydroxyethyl)-1H-pyrrol-3-yl]carbonyl]oxy]methyl]-1H-pyrrole-3-carboxylic acid
CAS:1260857-16-6
Clavulanate Potassium EP Impurity F
CVL06

4-[[[4-[(4-Bromo-2-fluorophenyl)amino]-6-methoxy-7-quinazolinyl]oxy]methyl]-1-piperidinemethanol
CAS:910298-61-2
Vandetanib N-Hydroxymethyl Analog
VDT51

4-[[17a-Hydroxy-19-norpregna-1,3,5(10)-trien-20-yn-3-yl]oxy]-19-norpregna-1,3,5(10)-trien-20-yne-3,17a-diol
CAS:303014-90-6
Ethinylestradiol 4-Oxy Dimer
ETE64

4-[[2-(2-Chloroethoxy)ethyl](2-chloroethyl)amino]-L-phenylalanine
CAS:2724549-95-3
Melphalan EP Impurity J 2-Chloroethoxy Dechloro M
MLP10

4-[[2-[[4-[bis(2-Chloroethyl)amino]-L-phenylalanyl]oxy]ethyl](2-chloroethyl)amino]-L-phenylalanine hydrochloride
Melphalan EP Impurity G Melphalan Dimer HCl
MLP07H

4-[[3-(4-METHYLPHENYL)-3-OXO-1-(TRIFLUOROMETHYL)PROPYLIDENE]AMINO]BENZENESULFONAMIDE
CAS:1061214-09-2
Celecoxib Impurity 5
CLC55

4-[[3-(Hydroxymethyl)phenyl]amino]-N-[[(1-methylethyl)amino]carbonyl]-3-pyridinesulfonamide
CAS:99300-68-2
Torsemide 3-Hydroxymethyl Impurity
TSM53

4-[[3-[[4-(Cyclopropylcarbonyl)-1-piperazinyl]carbonyl]-4-fluorophenyl]methyl]-1(2H)-phthalazinone
CAS:763113-22-0
Olaparib
OPB00

4-[[4-(2-Pyrimidinyl)-1-piperazinyl]methyl]-1,2-benzenediol
CAS:50602-50-1
Piribedil Desmethylene Impurity
PRB50

4-[[4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]methyl]-1,4-thiazinane 1,1-dioxide
CAS:1092563-25-1
Filgotinib Impurity 2
FTN52

4-[[4-[(4-Bromo-2,6-dimethylphenyl)amino]-2-pyrimidinyl]amino]-benzonitrile
CAS:374067-85-3
Rilpivirine Bromo Impurity
RLP55B

4-[[4-[[4-[(1E)-2-Cyanoethenyl]-2,6-dimethylphenyl]amino]-2-pyrimidinyl]amino] benzonitrile N1-Oxide
Rilpivirine N1-Oxide
RLP58B

4-[[4-[[4-[(1E)-2-Cyanoethenyl]-2,6-dimethylphenyl]amino]-2-pyrimidinyl]amino]benzonitrile
CAS:500287-72-9
Rilpivirine (Base)
RLP00B

4-[[4-[[4-[(1E)-2-Cyanoethenyl]-2,6-dimethylphenyl]amino]-2-pyrimidinyl]amino]benzonitrile HCl
CAS:700361-47-3
Rilpivirine HCl
RLP00H

4-[[4-[[4-[(1Z)-2-Cyanoethenyl]-2,6-dimethylphenyl]amino]-2-pyrimidinyl]amino]-benzonitrile
CAS:500287-94-5
Rilpivirine (Z)-Isomer
RLP50B

4-[[5-(4-Amidinophenoxy)pentyl]oxy]benzenecarboxamide
CAS:155914-97-9
Pentamidine EP Impurity A
PNM01B

4-[[5-Bromo-5-chloro-2-[(4-cyanophenyl)amino]-4-pyrimidinyl]oxy]-3,5-dimethyl-benzonitrile
CAS:269055-05-2
Etravirine 6-Desamino 5-Chloro Impurity
ETV65

4-[[5-BROMO-6-CHLORO-2-[(4-CYANOPHENYL)AMINO]-4-PYRIMIDINYL]OXY]-3,5-DIMETHYL-BENZONITRILE
CAS:269055-76-7
Etravirine 6-Desamino 6-Chloro Impurity
ETV66

4-[[6-(4-Carbamimidoylphenoxy)-hexyl]oxy]benzamide HCl
CAS:104236-65-9
Hexamidine EP Impurity A (HCl)
HXM01H

4-[[6-[(3R)-3-Amino-1-piperidinyl]-3,4-dihydro-3-methyl-2,4-dioxo-1(2H)-pyrimidinyl]methyl]benzonitrile
CAS:1638544-63-4
Alogliptin 4-Nitrile Analog Alogliptin Impurity A
ALG44B

4-[[6-Amino-5-bromo-2-[(4-cyanophenyl)amino]-4-pyrimidinyl]oxy]-3,5-bis(hydroxymethyl)benzonitrile
CAS:1246818-67-6
Etravirine Dihydroxy Impurity
ETV52

4-[[6-Amino-5-bromo-2-[(4-cyanophenyl)amino]-4-pyrimidinyl]oxy]-3,5-dimethyl-benzonitrile
CAS:269055-15-4
Etravirine
ETV00

4-[[6-Amino-5-bromo-2-[(4-cyanophenyl)amino]-4-pyrimidinyl]oxy]-3-hydroxymethylbenzonitrile
CAS:1246815-68-8
Etravirine Monohydroxy Impurity
ETV51

4-[[6-Chloro-2-[(4-cyanophenyl)amino]-4-pyrimidinyl]oxy]-3,5-dimethyl-benzonitrile
CAS:1070377-34-2
Etravirine 5-Desbromo 6-Chloro Impurity
ETV56

4-[1,5-Bis-(2-Methylsulfamoylethyl)-1H-indol-3-yl]-1-methylpyridinium
CAS:2144776-32-7
Naratriptan Impurity F (Base)
NRT56B

4-[1,5-BIS-(2-METHYLSULFAMOYLETHYL)-1H-INDOL-3-YL]-1-METHYLPYRIDINIUM CHLORIDE
CAS:2144776-33-8
Naratriptan Impurity F (Chloride)
NRT56H

4-[1-(2,3-Dimethyl phenyl)vinyl]imidazole
CAS:1021949-47-2
Medetomidine Vinyl Impurity DexMedetomidine USP R
MDT52

4-[1-(2,3-DIMETHYLPHENYL)ETHYL]-1H-IMIDAZOLE
CAS:86347-14-0
Medetomidine
MDT00B

4-[1-(2,3-DIMETHYLPHENYL)ETHYL]-1H-IMIDAZOLE HYDROCHLORIDE
CAS:86347-15-1
Medetomidine HCl
MDT00H

4-[1-(4-CHLOROPHENYL)-1-PHENYLETHOXY]-1-METHYLAZEPANE
CAS:61771-18-4
Clemastine EP Impurity B
CLM02

4-[1-(5,6,7,8-Tetrahydro-3,5,5,8,8-pentamethyl-2-naphthalenyl)ethenyl)benzoic acid
CAS:153559-49-0
Bexarotene
BXR00

4-[1-(5,6,7,8-Tetrahydro-3,5,5,8,8-pentamethyl-6-oxo-2-naphthalenyl) ethenyl]-benzoic acid
CAS:368451-13-2
Bexarotene 6-Oxo Impurity 6-Keto Bexarotene
BXR51

4-[1-(5,6,7,8-Tetrahydro-3,5,5,8,8-pentamethyl-7-oxo-2-naphthalenyl) ethenyl]-benzoic acid
CAS:368451-15-4
Bexarotene 7-Oxo Impurity 7-Keto Bexarotene
BXR53

4-[1-(5,6,7,8-Tetrahydro-6-hydroxy-3,5,5,8,8-pentamethyl-2-naphthalenyl) ethenyl]benzoic acid
CAS:368451-07-4
Bexarotene 6-Hydroxy Impurity
BXR50

4-[1-(5,6,7,8-Tetrahydro-7-hydroxy-3,5,5,8,8-pentamethyl-2-naphthalenyl) ethenyl]benzoic acid
CAS:368451-10-9
Bexarotene 7-Hydroxy Impurity
BXR52

4-[1-[[4-[2-(Hexahydro-1H-azepin-1-yl)ethoxy]phenyl]methyl]-3-methyl-5-(phenylmethoxy)-1H-indol-2-yl]phenol
CAS:328933-58-0
Bazedoxifene 5-O-Benzyl Impurity
BZD50

4-[1-[4-(Aminosulfonyl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-5-yl]benzoic acid methyl ester
CAS:1189893-75-1
Celecoxib Carboxylic Acid Methyl Ester
CLC49

4-[2-(1-PIPERIDINYL)ETHOXY]BENZOIC ACID HYDROCHLORIDE SALT
CAS:84449-80-9
Raloxifene Benzoic Acid Impurity
RLX31H

4-[2-(2-Amino-4,6-dioxo-4,5,6,7-tetrahydro-1H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl] benzoic acid
CAS:193265-47-3
Pemetrexed Dihydro 6-Oxo Acid
PMT32

4-[2-(2-Amino-4,6-dioxo-4,5,6,7-tetrahydro-1H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl] benzoic acid methyl ester
CAS:1320346-43-7
Pemetrexed Dihydro 6-Oxo Acid Methyl Ester
PMT33

4-[2-(2-Amino-4,7-Dihydro-4-Oxo-1H-Pyrrolo[2,3-D]Pyrimidin-5-YL)Ethyl] Benzoic Acid
CAS:137281-39-1
Pemetrexed Acid Pemetrexed Monoacid
PMT30

4-[2-(2-Amino-4,7-dihydro-4-oxo-1H-pyrrolo[2,3-d]pyrimidin-6-yl)ethyl] benzoic acid methyl ester
CAS:155405-80-4
Pemetrexed Acid Methyl Ester
PMT31

4-[2-(2-Hydroxyphenyl)diazenyl]-N-(pyridin-2-yl)benzenesulfonamide
CAS:66364-70-3
Sulfasalazine EP Impurity D
SSZ04

4-[2-(5-Chloro-2-methoxybenzamido) ethyl] benzenesulfonamide
CAS:16673-34-0
Glyburide EP Impurity A Glyburide USP RC A Glibe
GLB01

4-[2-(5-Ethyl-2-pyridinyl)-2-hydroxyethoxy]benzaldehyde
CAS:471295-98-4
Pioglitazone Hydroxy Aldehyde Impurity
PGT42

4-[2-(5-ETHYL-2-PYRIDINYL)ETHOXY]BENZALDEHYDE
CAS:114393-97-4
Pioglitazone Aldehyde Impurity
PGT24

4-[2-(CYCLOPROPYLMETHOXY)ETHYL]PHENOL
CAS:63659-16-5
Betaxolol EP Impurity D
BTX04H

4-[2-(Dimethylamino)-1-(1-hydroxycyclohexyl) ethyl]phenol
CAS:93413-62-8
Desvenlafaxine (Base) D,L-O-Desmethyl Venlafaxine
DVL00B

4-[2-(Dimethylamino)-1-(1-hydroxycyclohexyl) ethyl]phenol
CAS:93413-62-8
Venlafaxine O-Desmethyl Impurity O-Desmethyl Venl
VLF35B

4-[2-(Dimethylamino)-1-(1-hydroxycyclohexyl) ethyl]phenol HCl
CAS:300827-87-6
Venlafaxine O-Desmethyl Impurity (HCl) O-Desmethy
VLF35H

4-[2-(Dimethylamino)-1-(1-hydroxycyclohexyl) ethyl]phenol succinate
CAS:448904-47-0
Desvenlafaxine (Succinate) O-Desmethyl Venlafaxin
DVL00S

4-[2-(Dimethylamino)-1-(1-hydroxycyclohexyl) ethyl]phenol succinate
CAS:448904-47-0
Venlafaxine O-Desmethyl Succinate Desvenlafaxine
VLF35S

4-[2-(Dimethylamino)-1-(1-hydroxycyclohexyl) ethyl]phenol succinate monohydrate
CAS:386750-22-7
Desvenlafaxine (Succinate Monohydrate) O-Desmethy
DVL00X

4-[2-(DIMETHYLAMINO)-1-(1-HYDROXYCYCLOHEXYL)ETHYL]-2-[[[2-(1-HYDROXYCYCLOHEXYL)-2-(4-HYDROXYPHENYL)ETHYL]METHYLAMINO]METHYL]PHENOL
CAS:1187545-61-4
Desvenlafaxine N-Dimer Venlafaxine O-Desmethyl N-
DVL44B

4-[2-(DIMETHYLAMINO)-1-(1-HYDROXYCYCLOHEXYL)ETHYL]-2-[[[2-(1-HYDROXYCYCLOHEXYL)-2-(4-HYDROXYPHENYL)ETHYL]METHYLAMINO]METHYL]PHENOL
CAS:1187545-61-4
Venlafaxine N-Dimer O-Desmethyl Impurity Desvenla
DVL77

4-[2-(Dimethylamino)-1-(1-hydroxycyclohexyl)ethyl]phenol N-oxide
CAS:1021933-95-8
Venlafaxine O-Desmethyl N-Oxide Desvenlafaxine N-
VLF51

4-[2-(Dimethylamino)-1-(1-hydroxycyclohexyl)ethyl]phenol N-oxide
CAS:1021933-95-8
Desvenlafaxine N-Oxide O-Desmethyl Venlafaxine N-
DVL41B

4-[2-(DIPROPYLAMINO)ETHYL]-1,3-DIHYDRO-1-(HYDROXYMETHYL)-2H-INDOL-2-ONE
CAS:1027600-42-5
Ropinirole N-Hydroxymethyl Impurity
RPN41

4-[2-(Dipropylamino)ethyl]-1-hydroxy-2-indolinone
CAS:954117-22-7
Ropinirole N-Hydroxy Impurity (Base) N-Hydroxy R
RPN40B

4-[2-(Dipropylamino)ethyl]-1-hydroxy-2-indolinone HCl
CAS:1542267-72-0
Ropinirole N-Hydroxy Impurity (HCl) N-Hydroxy Ro
RPN40H

4-[2-(Dipropylamino)ethyl]-2-indolinone monohydrochloride
CAS:91374-20-8
Ropinirole Hydrochloride
RPN00H

4-[2-(Dipropylamino)ethyl]-2-indolinone n-oxide
CAS:1076199-41-1
Ropinirole N-oxide
RPN50B

4-[2-(Dipropylamino)ethyl]-2-indolinone n-oxide monohydrochloride
Ropinirole N-Oxide (HCl)
RPN50H

4-[2-(Dipropylamino)ethyl]indoline-2,3-dione
CAS:102842-51-3
Ropinirole EP Impurity A (Base) Ropinirole USP RC
RPN01B

4-[2-(Dipropylamino)ethyl]indoline-2,3-dione HCl
CAS:221264-21-7
Ropinirole EP Impurity A (HCl) Ropinirole USP RC
RPN01H

4-[2-(Methylamino)-1-(1-hydroxycyclohexyl) ethyl]phenol
CAS:135308-74-6
Desvenlafaxine USP RC B Desvenlafaxine N-Desmethy
DVL22B

4-[2-(Methylamino)-1-(1-hydroxycyclohexyl) ethyl]phenol
CAS:135308-74-6
Venlafaxine O-Desmethyl N-Desmethyl Impurity Desv
VLF65

4-[2-(PROPYLAMINO)ETHYL]-2-INDOLINONE
CAS:106916-16-9
Ropinirole EP Impurity D (Base) Monopropyl Ropini
RPN04B

4-[2-(Propylamino)ethyl]-2-indolinone monohydrochloride
CAS:173990-76-6
Ropinirole EP Impurity D (HCl) Monopropyl Ropinir
RPN04H

4-[2-(TERT-BUTYLAMINO)-1-HYDROXYETHYL]PHENOL
CAS:96948-64-0
Salbutamol EP Impurity B Salbutamol Deshydroxymet
SAB02B

4-[2-(TERT-BUTYLAMINO)-1-METHOXYETHYL]-2-(HYDROXYMETHYL)PHENOL
CAS:870076-72-5
Salbutamol EP Impurity A (Base) Levalbuterol USP
SAB01B

4-[2-(TERT-BUTYLAMINO)-1-METHOXYETHYL]-2-(HYDROXYMETHYL)PHENOL
CAS:870076-72-5
Levalbuterol USP RC H (Base) Salbutamol EP Impuri
LAB28B

4-[2-(tert-Butylamino)-1-methoxyethyl]-2-(hydroxymethyl)phenol formate
Levalbuterol USP RC H (Formate) Salbutamol EP Imp
LAB28F

4-[2-(tert-Butylamino)-1-methoxyethyl]-2-(hydroxymethyl)phenol formate
Salbutamol EP Impurity A (Formate) Levalbuterol U
SAB01F

4-[2-[(1,1-Dimethylethyl)amino]-1-hydroxyethyl]-2-methylphenol
CAS:18910-68-4
Levalbuterol USP RC B Salbutamol EP Impurity C A
LAB22B

4-[2-[(1,1-Dimethylethyl)amino]-1-hydroxyethyl]-2-methylphenol
CAS:18910-68-4
Salbutamol EP Impurity C (Base) Albuterol USP RC
SAB03B

4-[2-[(1,1-Dimethylethyl)amino]-1-hydroxyethyl]-2-methylphenol hemisulfate
CAS:2044704-57-4
Salbutamol EP Impurity C (Hemisulfate) Albuterol
SAB03S

4-[2-[(4-Dibenzo [b,f] [1,4]thiazepin-11-yl-1-piperazinyl)]ethyl]-1-[(2-hydroxy ethoxyl)ethyl]-piperazine HCl
Quetiapine Dipiperazine Monoether Impurity
QTP44H

4-[2-[[(2RS)-4-(4-Hydroxyphenyl)-butan-2-yl]amino]ethyl]-benzene-1,2-diol
CAS:34368-04-2
Dobutamine (Base)
DBM00B

4-[2-[[(2RS)-4-(4-Hydroxyphenyl)-butan-2-yl]amino]ethyl]-benzene-1,2-diol hydrochloride
CAS:49745-95-1
Dobutamine (HCl)
DBM00H

4-[2-[[3-(9H-Carbazol-4-yloxy)-2-hydroxypropyl]amino]ethoxy]-3-methoxy phenol
CAS:142227-49-4
Carvedilol 4-Hydroxy Metabolite 4-Hydroxy Carvedi
CVD34

4-[2-[[6-[(2-Phenylethyl)amino]hexyl]amino]ethyl]benzene-1,2-diol
CAS:86197-47-9
Dopexamine (Base)
DPX00B

4-[2-[[6-[(2-Phenylethyl)amino]hexyl]amino]ethyl]benzene-1,2-diol dihydrochloride
CAS:86484-91-5
Dopexamine Dihydrochloride
DPX00H

4-[2-[1-(4-METHYLPHENYL)ETHYLIDENE]HYDRAZINYL]BENZENESULFONAMIDE
CAS:1061214-06-9
Celecoxib Impurity 2
CLC52

4-[2-[2-(4-Dibenzo [b,f] [1,4]thiazepin-11-yl-1-piperazinyl)ethoxy]ethyl]-1-[(2-hydroxyethoxyl)ethyl]-piperazine
CAS:1800291-86-4
Quetiapine EP Impurity N (Base) Quetiapine Dipipe
QTP14B

4-[2-[2-(4-Dibenzo [b,f] [1,4]thiazepin-11-yl-1-piperazinyl)ethoxy]ethyl]-1-[(2-hydroxyethoxyl)ethyl]-piperazine trihydrochloride
Quetiapine EP Impurity N (3HCl) Quetiapine Dipipe
QTP14H

4-[2-[4-[1-(2-Ethoxyethyl)-1H-benzimidazol-2-yl]-1-piperidinyl]-1-hydroxyethyl]-a,a-dimethyl-benzeneacetic acid
CAS:1638785-23-5
Bilastine Impurity 3 (Base) Bilastine Hydroxy Imp
BLT53B

4-[2-[4-[1-(2-Ethoxyethyl)-1H-benzimidazol-2-yl]-1-piperidinyl]-1-hydroxyethyl]-a,a-dimethyl-benzeneacetic acid acetate salt
Bilastine Impurity 3 (Acetate) Bilastine Hydroxy
BLT53A

4-[2-[4-[1-(2-ETHOXYETHYL)-1H-BENZIMIDAZOL-2-YL]-1-PIPERIDINYL]ETHYL]-A,A-DIMETHYLBENZENEACETIC ACID
CAS:202189-78-4
Bilastine
BLT00B

4-[2-[BIS(2-CHLOROETHYL)AMINO]PHENYL]BUTANOIC ACID
CAS:134862-11-6
Chlorambucil meta Isomer meta-Chlorambucil
CLB53

4-[2-Hydroxy-3-[(1-methylethyl) amino]propoxy]-benzeneethanol hydrochloride
Metoprolol EP Impurity H (HCl) O-Desmethyl Metopr
MTP08H

4-[2-Hydroxy-3-[(1-methylethyl) amino]propoxy]-benzeneethanol tartrate
Metoprolol EP Impurity H (Tartrate) O-Desmethyl M
MTP08T

4-[2-Hydroxy-3-[(1-methylethyl)amino]propoxy]-benzeneethanol
CAS:62572-94-5
Metoprolol EP Impurity H (Base) O-Desmethyl Metop
MTP08B

4-[2-Hydroxy-3-[[2-(2-methoxyphenoxy)ethyl]amino]propoxy]-9H-carbazol-1-yl �-D-Glucopyranosiduronic Acid
CAS:131087-98-4
Carvedilol 1-Hydroxy 1-O-beta-D-Glucuronide
CVD52

4-[3,5-BIS(2-HYDROXYPHENYL)-1H-1,2,4-TRIAZOL-1-YL]BENZOIC ACID
CAS:201530-41-8
Deferasirox
DFR00

4-[3,5-Bis(2-hydroxyphenyl)-1H-1,2,4-triazol-1-yl]benzoic acid ethyl ester
CAS:201530-79-2
Deferasirox Ethyl Ester
DFR42

4-[3,5-Bis(2-hydroxyphenyl)-1H-1,2,4-triazol-1-yl]benzoic acid isopropyl ester
CAS:1266741-29-0
Deferasirox Isopropyl Ester
DFR43

4-[3,5-Bis(2-hydroxyphenyl)-1H-1,2,4-triazol-1-yl]benzoic acid methyl ester
CAS:1266741-05-2
Deferasirox Methyl Ester
DFR41

4-[3-(2-AMINOETHYL)-1H-INDOL-5-YL]METHYL-2-OXAZOLIDINONE
CAS:139264-15-6
Zolmitriptan EP Impurity D (Base) Zolmitriptan N,
ZMT04B

4-[3-(2-Aminoethyl)-1H-indol-5-yl]methyl-2-oxazolidinone HCl
Zolmitriptan EP Impurity D (HCl) Zolmitriptan N,N
ZMT04H

4-[3-(2-Chloro-10H-phenothiazin-10-yl)propyl]-1,1-dimethyl-piperazinium
CAS:756756-24-8 (cation)
Prochlorperazine N-Methyl (Base)
PCR50B

4-[3-(2-Chloro-10H-phenothiazin-10-yl)propyl]-1,1-dimethyl-piperazinium maleate
Prochlorperazine N-Methyl (Maleate)
PCR50M

4-[3-(2-Chloro-10H-phenothiazin-10-yl)propyl]-1-piperazineethanol 1-Oxide
CAS:803615-00-1
Perphenazine Impurity 2 Perphenazine N1-Oxide
PPZ72

4-[3-(4-Methylphenyl)-5-trifluoromethyl-1H-pyrazol-1-yl]benzenesulfonamide
CAS:331943-04-5
Celecoxib EP Impurity B Celecoxib USP RC B
CLC02

4-[3-[4-(6-Fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]propoxy]-3-methoxy benzoic acid
CAS:475110-48-6
Iloperidone carboxylic acid
ILP43

4-[3-[4-(6-Fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]propoxy]-3-methoxy-a-methylbenzenemethanol
CAS:133454-55-4
Iloperidone Hydroxy Impurity
ILP47

4-[3-[4-Cyano-3-(trifluoromethyl)phenyl]-5,5-dimethyl-4-oxo-2-thioxo-1-imidazolidinyl]-2-fluoro-benzoic Acid
CAS:1242137-15-0
Enzalutamide M1 Enzalutamide Carboxylic Acid
EZL51

4-[3-[4-CYANO-3-(TRIFLUOROMETHYL)PHENYL]-5,5-DIMETHYL-4-OXO-2-THIOXO-1-IMIDAZOLIDINYL]-2-FLUORO-N-METHYLBENZAMIDE
CAS:915087-33-1
Enzalutamide
EZL00

4-[3-[5-Oxido-2-(trifluoromethyl)-10H-phenothiazin-10-yl]propyl]-1-piperazineethanol dihydrochloride
CAS:1674-76-6
Fluphenazine Dihydrochloride EP Impurity A Fluphe
FPH01H

4-[3-[5-Oxido-2-(trifluoromethyl)-10H-phenothiazin-10-yl]propyl]-1-piperazineethanol dihydrochloride
CAS:1674-76-6
Fluphenazine Enantate EP Impurity A Fluphenazine
FPE01H

4-[3-[5-Oxido-2-(trifluoromethyl)-10H-phenothiazin-10-yl]propyl]-1-piperazineethanol dihydrochloride
CAS:1674-76-6
Fluphenazine Decanoate EP Impurity A Fluphenazine
FPD01H

4-[3-[BIS(2-CHLOROETHYL)AMINO]PHENYL]BUTANOIC ACID
CAS:178481-89-5
Chlorambucil ortho Isomer ortho-Chlorambucil
CLB52

4-[3-Chloro-4-[[(cyclopropylamino)carbonyl]amino]phenoxy]-1,2-dihydro-7-hydroxy-2-oxo-6-quinolinecarboxamide
CAS:1788901-76-7
Lenvatinib O-Desmethyl Quinolone
LVT55

4-[3-CHLORO-4-[[(CYCLOPROPYLAMINO)CARBONYL]AMINO]PHENOXY]-7-HYDROXY-6-QUINOLINECARBOXAMIDE
CAS:417717-04-5
Lenvatinib O-Desmethyl Impurity
LVT54

4-[3-CHLORO-4-[[(CYCLOPROPYLAMINO)CARBONYL]AMINO]PHENOXY]-7-METHOXY-6-QUINOLINECARBOXAMIDE
CAS:417716-92-8
Lenvatinib (Base)
LVT00B

4-[3-Chloro-4-[[(cyclopropylamino)carbonyl]amino]phenoxy]-7-methoxy-6-quinolinecarboxamide 1-Oxide
CAS:1788901-86-9
Lenvatinib N-Oxide
LVT53

4-[3-Chloro-4-[[(cyclopropylamino)carbonyl]amino]phenoxy]-7-methoxy-6-quinolinecarboxamide mesylate salt
CAS:857890-39-2
Lenvatinib (Mesylate)
LVT00M

4-[4-(2,3-Dichlorophenyl)-1-piperazinyl]butanol HCl
CAS:870765-38-1
Aripiprazole Hydroxybutylpiperazine Impurity
ARP42H

4-[4-(3'-Chlorobiphenyl-4-yl)-4-hydroxypiperidin-1-yl]-1-(4-?uorophenyl)butan-1-one
CAS:1391052-67-7
Haloperidol EP Impurity F 4-Dechloro-4-(3-chlorop
HPR06B

4-[4-(4'-Chlorobiphenyl-4-yl)-4-hydroxypiperidin-1-yl]-1-(4-?uorophenyl)butan-1-one
CAS:1391054-69-5
Haloperidol EP Impurity E 4-Dechloro-4-(4-chlorop
HPR05B

4-[4-(4'-CHLOROBIPHENYL-4-YL)-4-HYDROXYPIPERIDIN-1-YL]-N,N-DIMETHYL-2,2-DIPHENYLBUTANAMIDE
CAS:1391052-94-0
Loperamide EP Impurity A 4-Dechloro-4-(4-Chloroph
LPA01B

4-[4-(4-Chlorophenyl)-3,6-dihydropyridin-1(2H)-yl]-N,Ndimethyl-2,2-diphenylbutanamide
CAS:61299-42-1
Loperamide EP Impurity H Loperamide Oxide EP Impu
LPA08B

4-[4-(4-Chlorophenyl)-4-hydroxypiperidin-1-yl]-1-(2-?uorophenyl)butan-1-one
CAS:1391052-53-1
Haloperidol EP Impurity B (Base) Haloperidol USP
HPR02B

4-[4-(4-Chlorophenyl)-4-hydroxypiperidin-1-yl]-1-(2-?uorophenyl)butan-1-one HCl
Haloperidol EP Impurity B (HCl) Haloperidol USP R
HPR02H

4-[4-(4-Chlorophenyl)-4-hydroxypiperidin-1-yl]-1-(3-ethyl-4-?uorophenyl)butan-1-one
CAS:1391052-87-1
Haloperidol EP Impurity C 3-Ethyl Haloperidol
HPR03B

4-[4-(4-Chlorophenyl)-4-hydroxypiperidin-1-yl]-1-(4-?uorophenyl)butan-1-one
CAS:52-86-8
Haloperidol Decanoate EP Impurity G Haloperidol
HPD07B

4-[4-(4-Chlorophenyl)-4-hydroxypiperidin-1-yl]-1-(4-?uorophenyl)butan-1-one
CAS:52-86-8
Haloperidol Haloperidol Decanoate EP Impurity G
HPR00B

4-[4-(4-Chlorophenyl)-4-hydroxypiperidin-1-yl]-1-(4-?uorophenyl)butan-1-one N-Oxide
CAS:148406-51-3
Haloperidol N-oxide
HPR50

4-[4-(4-CHLOROPHENYL)-4-HYDROXYPIPERIDIN-1-YL]-1-[4-[4-(4-CHLOROPHENYL)-4-HYDROXYPIPERIDIN-1-YL]PHENYL]BUTAN-1-ONE
CAS:67987-08-0
Haloperidol EP Impurity D Haloperidol USP RC A
HPR04B

4-[4-(4-CHLOROPHENYL)-4-HYDROXYPIPERIDIN-1-YL]-N,N-DIMETHYL-2,2-DIPHENYLBUTANAMIDE
CAS:53179-11-6
Loperamide (Base) Loperamide Oxide EP Impurity A
LPA00B

4-[4-(4-chlorophenyl)-4-hydroxypiperidin-1-yl]-N,N-dimethyl-2,2-diphenylbutanamide hydrochloride
CAS:34552-83-5
Loperamide (HCl) Loperamide Hydrochloride Lopera
LPA00H

4-[4-(4-Chlorophenyl)-4-hydroxypiperidin-1-yl]-N-methyl-2,2-diphenylbutanamide
CAS:66164-07-6
Loperamide N-Desmethyl Impurity (Base)
LPA50B

4-[4-(4-Chlorophenyl)-4-hydroxypiperidin-1-yl]-N-methyl-2,2-diphenylbutanamide HCl
CAS:37743-37-6
Loperamide N-Desmethyl Impurity (HCl)
LPA50H

4-[4-(Diphenylmethoxy)-1-piperidinyl]-1-[4-(2-hydroxy-1,1-dimethylethyl)phenyl]-1-butanone
CAS:210686-41-2
Ebastine Hydroxy Impurity
EBN50

4-[4-[(2-Chloroethyl)(2-hydroxyethyl)amino]phenyl]butanoic acid
CAS:27171-89-7
Chlorambucil EP Impurity A N-(2-Hydroxyethyl) Chl
CLB01

4-[4-[(2-Chloroethyl)amino]phenyl]butanoic acid
CAS:116505-53-4
Chlorambucil EP Impurity B N-Des-(2-Chloroethyl)
CLB02

4-[4-[(5S)-5-(AMINOMETHYL)-2-OXO-3-OXAZOLIDINYL]PHENYL]-3-MORPHOLINONE
CAS:446292-10-0
Rivaroxaban Aminomethyl Impurity (Base)
RVR45B

4-[4-[(5S)-5-(Aminomethyl)-2-oxo-3-oxazolidinyl]phenyl]-3-morpholinone HCl
CAS:898543-06-1
Rivaroxaban Aminomethyl Impurity (HCl)
RVR45H

4-[4-[(5S)-5-PHTHALIMIDOMETHYL-2-OXO-3-OXAZOLIDINYL]PHENYL]-3-MORPHOLINONE
CAS:446292-08-6
Rivaroxaban EP Impurity G Rivaroxaban USP RC G R
RVR07

4-[4-[(AMINOCARBONYL)AMINO]-3-CHLOROPHENOXY]-7-METHOXY-6-QUINOLINECARBOXAMIDE
CAS:417719-51-8
Lenvatinib N-Descyclopropyl Impurity
LVT52

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]-3-fluorophenoxy]-2-pyridinecarboxamide
CAS:1343498-72-5
Regorafenib N-Desmethyl Impurity
RGR51

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]-3-fluorophenoxy]-2-pyridinecarboxamide 1-Oxide
CAS:835621-12-0
Regorafenib N-Desmethyl Pyridine-N-Oxide
RGR53

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]-3-fluorophenoxy]-N-(hydroxymethyl)-2-pyridinecarboxamide
CAS:1343498-71-4
Regorafenib N-Desmethyl N-Hydroxymethyl Impurity
RGR52

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]-3-fluorophenoxy]-N-methyl-2-pyridinecarboxamide
CAS:755037-03-7
Regorafenib (Anhydrous)
RGR00A

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]-3-fluorophenoxy]-N-methyl-2-pyridinecarboxamide 1-Oxide
CAS:835621-11-9
Regorafenib Pyridine-N-Oxide
RGR56

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]phenoxy]-1-oxido-2-pyridinecarboxamide
CAS:583840-04-4
Sorafenib N-Desmethyl N-Oxide
SRF40

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]phenoxy]-2-pyridinecarboxamide
CAS:284461-74-1
Sorafenib N-Desmethyl Impurity
SRF41

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]phenoxy]-2-pyridinecarboxylic-acid
CAS:1012058-78-4
Sorafenib Carboxylic Acid
SRF52

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]phenoxy]-2-pyridinecarboxylic-acid methyl ester
CAS:573673-43-5
Sorafenib Carboxylic Acid Methyl Ester
SRF53

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]phenoxy]-N-methyl-1-oxido-2-pyridinecarboxamide
CAS:583840-03-3
Sorafenib N-oxide
SRF42

4-[4-[[[[4-CHLORO-3-(TRIFLUOROMETHYL)PHENYL]AMINO]CARBONYL]AMINO]PHENOXY]-N-METHYL-2-PYRIDINECARBOXAMIDE
CAS:284461-73-0
Sorafenib (Base)
SRF00B

4-[4-[[[[4-Chloro-3-(trifluoromethyl)phenyl]amino]carbonyl]amino]phenoxy]-N-methyl-2-pyridinecarboxamide tosylate
CAS:475207-59-1
Sorafenib tosylate
SRF00T

4-[4-[[2-[[4-[4-[[2-[[4-[4-[Bis(2-Chloroethyl)amino]-phenyl]butanoyl]oxy]ethyl](2-chloroethyl)amino]-phenyl]butanoyl]oxy]ethyl](2-chloroethyl)amino]-phenyl]butanoic acid
Chlorambucil EP Impurity F Chlorambucil Trimer Im
CLB06

4-[4-[[2-[[4-[4-[Bis(2-Chloroethyl)amino]phenyl]-butanoyl]oxy]ethyl](2-chloroethyl)amino]phenyl]butanoic acid
CAS:1988791-13-4
Chlorambucil EP Impurity E Chlorambucil Dimer Imp
CLB05

4-[4-[[2-[[BIS(2-CHLOROETHOXY)PHOSPHORYL]OXY]ETHYL](2-CHLOROETHYL)AMINO]PHENYL]BUTANOIC ACID
Chlorambucil EP Impurity C
CLB03

4-[4-[4-(4-Methoxyphenyl)piperazin-1-yl]phenyl]-2-[(1RS)-1-methyl propyl]-2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:252964-68-4
Itraconazole EP Impurity A Itraconazole Methoxy I
ICZ01

4-[4-[4-[4-[[2-(2,4-Dichlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]-1-piperazinyl]phenyl]-2,4-dihydro-2-(2-hydroxy-1-methylpropyl)-3H-1,2,4-triazol-3-one R-63373
CAS:112559-91-8
Itraconazole 2-Hydroxy Metabolite
ICZ31

4-[4-[4-[4-[[2-(2,4-Dichlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]-1-piperazinyl]phenyl]-2,4-dihydro-2-(2-oxo-1-methylpropyl)-3H-1,2,4-triazol-3-one R-63373
CAS:112560-33-5
Itraconazole 2-Oxo Metabolite Itraconazole Ketone
ICZ32

4-[4-[4-[4-[[cis-2-(2,4-Dichlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy] phenyl]piperazin-1-yl]phenyl]-2-[(1RS)-1-methyl propyl]-2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:84625-61-6
Itraconazole
ICZ00

4-[4-[4-[4-[[CIS-2-(2,4-DICHLOROPHENYL)-2-(1H-1,2,4-TRIAZOL-1-YLMETHYL)-1,3-DIOXOLAN-4-YL]METHOXY]PHENYL]PIPERAZIN-1-YL]PHENYL]-2-(1-METHYL ETHYL)-2,4-DIHYDRO-3H-1,2,4-TRIAZOL-3-ONE
CAS:89848-49-7
Itraconazole EP Impurity D Itraconazole Isopropyl
ICZ04

4-[4-[4-[4-[[cis-2-(2,4-Dichlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]piperazin-1-yl]phenyl]-2-[[cis-2-(2,4-dichloro phenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methyl]-2,4-dihydro-3H-1,2,4-triazol-3-one
Itraconazole EP Impurity G Itraconazole Didioxol
ICZ07

4-[4-[4-[4-[[CIS-2-(2,4-DICHLOROPHENYL)-2-(1H-1,2,4-TRIAZOL-1-YLMETHYL)-1,3-DIOXOLAN-4-YL]METHOXYPHENYL]PIPERAZIN-1-YL]PHENYL]-2-PROPYL-2,4-DIHYDRO-3H-1,2,4-TRIAZOL-3-ONE
CAS:74855-91-7
Itraconazole EP Impurity C Itraconazole Propyl An
ICZ03

4-[4-[4-[4-[[cis-2-(2,4-Dichlorophenyl)-2-(4H-1,2,4-triazol-4-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]piperazin-1-yl]phenyl]-2-[(1RS)-1-methyl propyl]-2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:854372-77-3
Itraconazole EP Impurity B Itraconazole N4-Isomer
ICZ02

4-[4-[4-[4-[[trans-2-(2,4-Dichlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-1,3-dioxolan-4-yl]methoxy]phenyl]piperazin-1-yl]phenyl]-2-[(1RS)-1-methylpropyl] -2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:252964-65-1
Itraconazole EP Impurity E trans-Itraconazole
ICZ05

4-[4-[4-[4-HYDROXYPHENYL]PIPERAZIN-1-YL]PHENYL]-2-(1-METHYLPROPYL)-2,4-DIHYDRO-3H-1,2,4-TRIAZOL-3-ONE
CAS:106461-41-0
Itraconazole Hydroxy Isobutyltriazolone Impurity
ICZ90

4-[4-[4-[4-Hydroxyphenyl]piperazin-1-yl]phenyl]-2-butyl-2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:89848-20-4
Itraconazole Hydroxy Butyltriazolone Impurity
ICZ96

4-[4-[4-[4-Hydroxyphenyl]piperazin-1-yl]phenyl]-2-isopropyl-2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:89848-19-1
Itraconazole Hydroxy Isopropyltriazolone Impurity
ICZ94

4-[4-[4-[4-Hydroxyphenyl]piperazin-1-yl]phenyl]-2-propyl-2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:79538-91-3
Itraconazole Hydroxy Propyltriazolone Impurity
ICZ93

4-[4-[4-[4-Methoxyphenyl]piperazin-1-yl]phenyl]-2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:74853-07-9
Itraconazole Methoxy Triazolone Impurity Posacona
ICZ74

4-[4-[4-[4-Methoxyphenyl]piperazin-1-yl]phenyl]-2-butyl-2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:89848-15-7
Itraconazole Methoxy Butyltriazolone Impurity
ICZ86

4-[4-[4-[4-Methoxyphenyl]piperazin-1-yl]phenyl]-2-isopropyl-2,4-dihydro-3H-1,2,4-triazol-3-one
Itraconazole Methoxy Isopropyltriazolone Impurity
ICZ84

4-[4-[4-[4-Methoxyphenyl]piperazin-1-yl]phenyl]-2-propyl-2,4-dihydro-3H-1,2,4-triazol-3-one
CAS:74852-92-9
Itraconazole Methoxy Propyltriazolone Impurity
ICZ83

4-[4-[6-Amino-5-[(1R)-1-(2,6-Dichloro-3-fluorophenyl)ethoxy]-3-pyridinyl]-1H-pyrazol-1-yl]-2-piperidinone
CAS:1415558-82-5
Crizotinib 2-Keto Impurity
CRZ52

4-[4-[BIS(2-CHLOROETHYL)AMINO]PHENYL]BUTANOIC ACID
CAS:305-03-3
Chlorambucil
CLB00

4-[4-[Ethyl[(2RS)-1-(4-methoxyphenyl)propan-2-yl]amino]butoxy]butyl 3,4-dimethoxybenzoate
Mebeverine EP Impurity K
MBV11

4-[4-Fluoro-2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidin-1-yl] benzoyl]-N-acetylpiperidine
Risperidone Acetylpiperidine Impurity
RSP39

4-[4-Fluoro-2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidin-1-yl] benzoyl]-piperidine
Risperidone Piperidine Impurity
RSP49

4-[5-(2,4-DIMETHYLPHENYL)-3-(TRIFLUOROMETHYL)-1H-PYRAZOL-1-YL]BENZENESULFONAMIDE
CAS:170570-09-9
Celecoxib 2,4-Dimethyl 2-Methyl Celecoxib
CLC44

4-[5-(2,5-DIMETHYLPHENYL)-3-(TRIFLUOROMETHYL)-1H-PYRAZOL-1-YL]BENZENESULFONAMIDE
CAS:457639-26-8
Celecoxib 2,5-Dimethyl
CLC45

4-[5-(2-Methylphenyl)-3-trifluoromethyl-1H-pyrazol-1-yl]benzenesulfonamide
CAS:170569-99-0
Celecoxib 2-Methyl Analog
CLC42

4-[5-(3-Methylphenyl)-3-trifluoromethyl-1H-pyrazol-1-yl]benzenesulfonamide
CAS:170570-01-1
Celecoxib EP Impurity A Celecoxib USP RC A Celec
CLC01

4-[5-(4-Carboxyphenyl)-3-trifluoromethyl-1H-pyrazol-1-yl]benzene sulfon amide
CAS:170571-01-4
Celecoxib carboxylic acid
CLC40

4-[5-(4-METHYLPHENYL)-3-TRIFLUOROMETHYL-1H-PYRAZOL-1-YL]BENZENESULFONAMIDE
CAS:169590-42-5
Celecoxib
CLC00

4-[5-[4-(Hydroxymethyl)phenyl]-3-(trifluoromethyl)-1H-pyrazol-1-yl] benzene sulfonamide
CAS:170571-00-3
Celecoxib Hydroxymethyl Analog
CLC34

4-[6-(2-Chloroethyl)-3,6,7,8-tetrahydro-3-methylimidazo[4,5-h][1,4]benzothiazin-2-yl]butanoic acid
CAS:191939-34-1
Bendamustine USP RC G (Base)
BDM27B

4-[6-(2-Chloroethyl)-3,6,7,8-tetrahydro-3-methylimidazo[4,5-h][1,4]benzothiazin-2-yl]butanoic acid HCl
Bendamustine USP RC G (HCl)
BDM27H

4-[6-[[5-[[(2-CHLORO-6-METHYLPHENYL)AMINO]CARBONYL]-2-THIAZOLYL]AMINO]-2-METHYL-4-PYRIMIDINYL]-1-PIPERAZINEACETIC ACID
CAS:910297-53-9
Dasatinib carboxylic acid
DST41

4-[6-[[5-[[(2-CHLORO-6-METHYLPHENYL)AMINO]CARBONYL]-2-THIAZOLYL]AMINO]-2-METHYL-4-PYRIMIDINYL]-1-PIPERAZINEACETIC ACID ETHYL ESTER
CAS:910297-62-0
Dasatinib Carboxylic Acid Ethyl Ester
DST42

4-[6-Carboxy-9-fluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[3,2,1-ij][4,1,2]benzoxadiazin-10-yl]-1-methylpiperazine 1-oxide
CAS:194023-72-8
Marbofloxacin EP Impurity F Marbofloxacin N-Oxide
MBF06

4-[6-Hydroxy-3-[4-[2-(1-piperidinyl)ethoxy]benzoyl]benzo[b]thien-2-yl]phenyl-�-D-glucopyranosiduronic Acid
CAS:182507-22-8
Raloxifene p-�-D-Glucuronide
RLX50A

4-[6-Hydroxy-3-[4-[2-(1-piperidinyl)ethoxy]benzoyl]benzo[b]thien-2-yl]phenyl-�-D-glucopyranosiduronic acid lithium salt
Raloxifene p-�-D-Glucuronide Lithium Salt
RLX50L

4-[7-[6-Cyano-5-(trifluoromethyl)-3-pyridinyl]-8-oxo-6-thioxo-5,7-diazaspiro[3.4]oct-5-yl]-2-fluoro-N-methylbenzamide
CAS:956104-40-8
Apalutamide
APD00

4-[7-[6-Cyano-5-(trifluoromethyl)-3-pyridinyl]-8-oxo-6-thioxo-5,7-diazaspiro[3.4]oct-5-yl]-2-fluorobenzamide
CAS:1332391-11-3
Apalutamide RC 8
APD68

4-[7-[6-Cyano-5-(trifluoromethyl)pyridin-3-yl]-6,8-bis(sulfanylidene)-5,7-diazaspiro[3.4]octan-5-yl]-2-fluoro-N-methylbenzamide
CAS:2649802-40-2
Apalutamide RC 7
APD67

4-[7-[6-Cyano-5-(trifluoromethyl)pyridin-3-yl]-6,8-dioxo-5,7-diazaspiro[3.4]octan-5-yl]-2-fluoro-N-methylbenzamide
Apalutamide RC 3
APD63

4-[7-[6-Cyano-5-(trifluoromethyl)pyridin-3-yl]-8-oxo-6-sulfanylidene-5,7-diazaspiro[3.4]octan-5-yl]-2-fluoro-N-(2-methoxyethyl)-N-methylbenzamide
CAS:1332391-30-6
Apalutamide RC 2
APD62

4-[9-Chloro-17-[(furan-2-ylcarbonyl)oxy]-11�-hydroxy-16a-methyl-3-oxoandrosta-1,4-dien-17�-yl]-5H-1,2-oxathiole 2,2-dioxide
CAS:223776-49-6
Mometasone EP Impurity B Mometasone BP Impurity B
MTS02

4-[bis(2-Chloroethyl)amino]-3-chloro-L-phenylalanine hydrochloride
Melphalan EP Impurity F (HCl) 3-Chloromelphalan H
MLP06H

4-[Bis(2-Chloroethyl)amino]-D-phenylalanine (R)-2-Amino-3-(4-(bis(2-chloroethyl)amino)phenyl)propanoic acid
CAS:13045-94-8
Melphalan R-Isomer D-Melphalan
MLP50B

4-[BIS(2-CHLOROETHYL)AMINO]-L-PHENYLALANINE
CAS:148-82-3
Melphalan (Base)
MLP00B

4-[Bis(2-Chloroethyl)amino]-L-phenylalanine HCl
CAS:7/2/3223
Melphalan (HCl) Melphalan Hydrochloride
MLP00H

4-[bis(2-Hydroxyethyl)amino]-L-phenylalanine
CAS:72143-20-5
Melphalan EP Impurity A Dihydroxy Melphatalan
MLP01

4-[CIS-4-(4-CHLOROPHENYL)-4-HYDROXY-1-OXIDOPIPERIDIN-1-YL]-N,N-DIMETHYL-2,2-DIPHENYLBUTANAMIDE
CAS:109572-89-6
Loperamide EP Impurity G Loperamide N-Oxide cis-I
LPA07B

4-[Ethyl[(2RS)-1-(4-methoxy-3-methylphenyl)propan-2-yl]amino]butyl 3,4-dimethoxybenzoate
CAS:2512206-37-8
Mebeverine EP Impurity O
MBV15

4-[Ethyl[(2RS)-1-(4-methoxyphenyl)propan-2-yl]amino]butyl 2-chloro-4,5-dimethoxybenzoate
Mebeverine EP Impurity N
MBV14

4-[Ethyl[(2RS)-1-(4-methoxyphenyl)propan-2-yl]amino]butyl 3-hydroxy-4-methoxybenzoate
CAS:2514745-46-9
Mebeverine EP Impurity I
MBV09

4-[Ethyl[(2RS)-1-(4-methoxyphenyl)propan-2-yl]amino]butyl 4-hydroxy-3-methoxybenzoate
Mebeverine EP Impurity H
MBV08

4-[trans-4-(4-Chlorophenyl)-4-hydroxy-1-oxidopiperidin-1-yl]-N,N-dimethyl-2,2-diphenylbutanamide
CAS:106900-12-3
Loperamide EP Impurity F (Base) Loperamide USP RC
LPA06B

4-[trans-4-(4-Chlorophenyl)-4-hydroxy-1-oxidopiperidin-1-yl]-N,N-dimethyl-2,2-diphenylbutanamide HCl
Loperamide EP Impurity F (HCl) Loperamide USP RC
LPA06H

4-{[(2,4-Diaminopteridin-6-yl)methyl](methyl)amino}benzoic acid 2,4-Diamino-N10-methylpterioc acid
CAS:19741-14-1
Methotrexate EP Impurity E (Base) Methotrexate US
MTX05B

4-{[(2,4-Diaminopteridin-6-yl)methyl](methyl)amino}benzoic acid hemihydrochloride 2,4-Diamino-N10-methylpterioc acid hemihydrochloride
CAS:70844-48-3
Methotrexate EP Impurity E (HCl) Methotrexate USP
MTX05H

4-{4-(Dimethylamino)-[1-(4-fluorophenyl)-1-hydroxybutyl]}-3-(hydroxymethyl) benzonitrile
CAS:103146-25-4
Citalopram Dihydroxy Impurity (Base) EsCitalopram
CTL20B

4-{4-(Dimethylamino)-[1-(4-fluorophenyl)-1-hydroxybutyl]}-3-(hydroxymethyl) benzonitrile
CAS:103146-25-4
EsCitalopram EP Impurity E (Base) Escitalopram US
ECT05B

4-{4-(Dimethylamino)-[1-(4-fluorophenyl)-1-hydroxybutyl]}-3-(hydroxymethyl) benzonitrile di-p-toluoyl-D-tartrate salt (21)
CAS:128173-53-5
Citalopram Dihydroxy Impurity (DTT) EsCitalopram
CTL20T

4-{4-(Dimethylamino)-[1-(4-fluorophenyl)-1-hydroxybutyl]}-3-(hydroxymethyl) benzonitrile di-p-toluoyl-D-tartrate salt (21)
CAS:128173-53-5
EsCitalopram EP Impurity E (DTT) Escitalopram USP
ECT05T

4-{4-(Dimethylamino)-[1-(4-fluorophenyl)-1-hydroxybutyl]}-3-(hydroxymethyl) benzonitrile HBr
CAS:103146-26-5
EsCitalopram EP Impurity E (HBr) Escitalopram USP
ECT05H

4-{4-(Dimethylamino)-[1-(4-fluorophenyl)-1-hydroxybutyl]}-3-(hydroxymethyl) benzonitrile HBr
CAS:103146-26-5
Citalopram Dihydroxy Impurity (HBr) EsCitalopram
CTL20H

4-{4-[4-(PENTYLOXY)PHENYL]PHENYL}BENZOIC ACID
CAS:158938-08-0
Anidulafungin Side Chain Acid
ADF31

4-{4-[4-(Pentyloxy)phenyl]phenyl}benzoic acid methyl ester
CAS:158937-30-5
Anidulafungin Side Chain Methyl Ester
ADF33

4-{6-(4-Fluorophenyl)-7,8-epoxy-6-hydroxy-8a-isopropyl-7-phenyl-8-(phenyl carbamoyl)hexahydro-2H -pyrrolo[2,1-b][1,3]oxazin-2-yl}-3-hydroxybutanoic acid
CAS:873950-17-5
Atorvastatin FXA Impurity (Acid) Atorvastatin Cyc
ATV64A

4-{6-(4-Fluorophenyl)-7,8-epoxy-6-hydroxy-8a-isopropyl-7-phenyl-8-(phenyl carbamoyl)hexahydro-2H -pyrrolo[2,1-b][1,3]oxazin-2-yl}-3-hydroxybutanoic acid sodium salt
CAS:1316291-19-6
Atorvastatin FXA Impurity (Sodium) Atorvastatin S
ATV64N

4-{6-[6-Bromo-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydro-Pyrido[2,3-d]pyrimidin-2-ylamino]pyridin-3-yl}-piperazine-1-carboxylic acid tert-butyl ester
CAS:571188-82-4
Palbociclib N-BOC 6-Bromo Analog 6-Desacetyl 6-Br
PBC42B

4-{6-[8-Cyclopentyl-5-methyl-7-oxo-7,8-dihydro-Pyrido[2,3-d]pyrimidin-2-ylamino]pyridin-3-yl}-piperazine-1-carboxylic acid tert-butyl ester
CAS:571189-65-6
Palbociclib Desacetyl N-BOC Analog Desacetyl N-BO
PBC41B

4-2-(Dipropylamino)ethyl)-3-methoxyindoline-2-one HCl 3-Methoxy Ropinirole HCl
CAS:1797131-21-5
Ropinirole 3-Methoxy Impurity
RPN32H

4-Acetamido-3-bromobenzene-1-sulfonyl chloride
CAS:88963-75-1
Sulfasalazine RC 1
SSZ51

4-Acetamido-5-bromo-N-(2-(diethylamino)ethyl)-2-methoxybenzamide
CAS:94135-22-5
Bromopride Impurity A N-Acetyl Bromopride
BPX51

4-Acetamido-N-(2-(diethylamino)ethyl)benzamide
CAS:32795-44-1
Procainamide N-Acetyl Impurity (Base)
PCA51B

4-ACETAMIDO-N-(2-(DIETHYLAMINO)ETHYL)BENZAMIDE HYDROCHLORIDE
CAS:34118-92-8
Procainamide N-Acetyl Impurity (HCl)
PCA51H

4-ACETAMIDOBENZOIC ACID
CAS:556-08-1
Acedoben
ADB00

4-ACETYL BIPHENYL
CAS:92-91-1
Felbinac EP Impurity A
FBN01

4-ACETYL-2-(1-(3,4-DIMETHOXYPHENYL)-2-(METHYLSULFONYL)ETHYL)ISOINDOLINE-1,3-DIONE
CAS:2487573-02-2
Apremilast EP Impurity C Apremilast Acetyl Analog
APM03

4-Acetyl-2-[[acetyl[3,5-bis[(2,3-dihydroxypropyl)carbamoyl]-2,4,6-triiodo phenyl]amino]methyl]-N,N'-bis(2,3-dihydroxypropyl)-5,7-diiodo-3,4-dihydro-2H-1,4benzoxazine-6,8-dicarboxamide
CAS:171897-72-6
Iodixanol EP Impurity G N-Acetyl Cyclized Iodixa
IDX07

4-ACETYL-2-PROPYL-1H-IMIDAZOLE-5-CARBOXYLIC ACID
CAS:1025972-83-1
Olmesartan Impurity 3
OLM63

4-ACETYLOXY-5-HYDROXY-9,10-DIOXO-ANTHRACENE-2-CARBOXYLIC ACID
CAS:875535-36-7
Diacerein EP Impurity E 4-Acetyl Rhein Monoacety
DAR05

4-ACETYLPHENYL BENZOATE
CAS:1523-18-8
Salbutamol RC 2
SAB62

4-Amino-?-(aminocarbonyl)-1,3-dihydro-1,3-dioxo-2H-isoindole-2-butanoic acid
CAS:918314-45-1
Pomalidomide Hydrolyzed M10
PLD50B

4-AMINO-1,3,5-TRIAZIN-2(1H)-ONE
CAS:931-86-2
Azacitidine USP RC A 5-Aza Cytosine
AZC21

4-AMINO-1,3,5-TRIAZIN-2(5H)-ONE
CAS:931-86-2
Decitabine Triazinone Impurity 5-Aza Cytosine Az
DCT40

4-AMINO-1,5-DIMETHYL-2-PHENYL-2,3-DIHYDRO-1H-PYRAZOL-3-ONE
CAS:83-07-8
Metamizole EP Impurity B 4-Aminophenazone
MMZ02

4-Amino-1-((2R,3R,4R,5R)-3,4-dihydroxy-5-(hydroxymethyl)-tetrahydrofuran-2-yl)pyrimidin-2(1H)-one
CAS:147-94-4
Cytarabine
CTB00B

4-Amino-1-((2R,3R,4R,5R)-3,4-dihydroxy-5-(hydroxymethyl)-tetrahydrofuran-2-yl)pyrimidin-2(1H)-one HCl
CAS:69-74-9
Cytarabine HCl
CTB00H

4-Amino-1-((2R,3R,4R,5S)-5-(chloromethyl)-3,4-dihydroxy-tetrahydrofuran-2-yl)pyrimidin-2(1H)-one
CAS:32659-31-7
Cytarabine Deoxy Chloro Impurity
CTB51

4-Amino-1-(2,5-anhydro-�-D-arabinofuranosyl)-pyrimidin-2(1H)-one
CAS:32830-01-6
Cytarabine EP Impurity F
CTB06

4-Amino-1-(2-deoxy-2,2-difluoro-a-D-erythropentofuranosyl)pyrimidin-2(1H)-one
CAS:95058-85-8
Gemcitabine EP Impurity B (Base) Gemcitabine BP I
GCT02B

4-Amino-1-(2-deoxy-2,2-difluoro-a-D-erythropentofuranosyl)pyrimidin-2(1H)-one hydrochloride
CAS:122111-05-1
Gemcitabine EP Impurity B (HCl) Gemcitabine BP Im
GCT02H

4-Amino-1-(2-deoxy-2,2-difluoro-�-D-erythropentofuranosyl)pyrimidin-2(1H)-one
CAS:95058-81-4
Gemcitabine
GCT00B

4-Amino-1-(2-deoxy-2,2-difluoro-�-D-erythropentofuranosyl)pyrimidin-2(1H)-one hydrochloride
CAS:122111-03-9
Gemcitabine HCl
GCT00H

4-Amino-1-(2-deoxy-a-D-erythro-pentofuranosyl)-s-triazin-2(1H)-one
CAS:22432-95-7
Decitabine USP RC E Decitabine alpha-Isomer a-De
DCT25

4-Amino-1-(2-deoxy-beta-erythro-pentofuranosyl)-1,3,5-triazin-2(1H)-one 5-aza-2�-deoxycytidine
CAS:2353-33-5
Decitabine �-Decitabine 5-Aza-2'-deoxy Cytidine
DCT00

4-Amino-1-(deoxy-2,2-difluoro-D-threo-pentofuranosyl)-2(1H)-pyrimidinone
CAS:103882-85-5
Gemcitabine 3-Epimer
GCT43

4-Amino-1-[(2R,3R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl] pyrimidin-2(1H)-one S-oxide
CAS:160552-54-5
Lamivudine EP Impurity H Lamivudine (3R)-Sulfoxid
LMV08

4-Amino-1-[(2R,3S,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl] pyrimidin-2(1H)-one S-oxide
CAS:160552-55-6
Lamivudine EP Impurity G Lamivudine (3S)-Sulfoxid
LMV07

4-Amino-1-[(2R,5R)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl] pyrimidin-2(1H)-one
CAS:139757-68-9
Lamivudine 5-Epimer (2R,5R)-Lamivudine
LMV55

4-Amino-1-[(2R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl] pyrimidin-2(1H)-one
CAS:134678-17-4
Lamivudine (2R,5S)-Lamivudine Emtricitabine IP I
LMV00

4-Amino-1-[(2R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl] pyrimidin-2(1H)-one
CAS:134678-17-4
Emtricitabine IP Impurity C Lamivudine Desfluoro
EMT53

4-Amino-1-[(2R,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl] pyrimidin-2(1H)-one S-oxide
CAS:1235712-40-9
Lamivudine Sulfoxide
LMV78

4-Amino-1-[(2RS)-2-(2,4-difluorophenyl)-2-hydroxy-3(1H-1,2,4-triazol-1-yl)propyl]-4H-1,2,4-triazolium bromide
CAS:150168-54-0
Fluconazole EP Impurity I Fluconazole Amino Impur
FLC09

4-Amino-1-[(2RS,5RS)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl]pyrimidin-2(1H)-one
Lamivudine EP Impurity B (2RS,5RS)-Lamivudine (+
LMV02

4-Amino-1-[(2S,4S)-2-(hydroxymethyl)-1,3-dioxolan-4-yl] pyrimidin-2(1H)-one
CAS:145918-75-8
Lamivudine EP Impurity I Lamivudine Dioxolan Impu
LMV09

4-Amino-1-[(2S,5R)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl]pyrimidin-2(1H)-one
CAS:134680-32-3
Lamivudine EP Impurity D Lamivudine Enantiomer (
LMV04

4-Amino-1-[(2S,5S)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl]pyrimidin-2(1H)-one
CAS:136846-20-3
Lamivudine 2-Epimer (2S,5S)-Lamivudine Lamivudin
LMV52

4-Amino-1-[10-[(2-methylquinolin-4-yl)amino]decyl]-2-methylquinolinium iodide
CAS:747387-02-6
Dequalinium EP Impurity B
DQL02

4-Amino-1-[2-deoxy-3-O-(4-methylbenzoyl)-�-D-erythro-pentofuranosyl]-1,3,5-triazin-2(1H)-one
CAS:183016-21-9
Decitabine 3-Toluoyl Impurity Decitabine Impurity
DCT35

4-Amino-1-[3,5-bis-O-(4-chlorobenzoyl)-2-deoxy-a-D-erythro-pentofurano syl]-1,3,5-triazin-2(1H)-one
CAS:1140891-02-6
Decitabine USP RC C
DCT23

4-Amino-1-[3,5-bis-O-(4-chlorobenzoyl)-2-deoxy-�-D-erythropentofuranosyl]- 1,3,5-triazin-2(1H)-one
CAS:1034301-08-0
Decitabine USP RC B
DCT22

4-Amino-1-a-D-ribofuranosyl-1,3,5-triazin-2(1H)-one
CAS:157771-77-2
Azacitidine RC 2 a-Azacitidine
AZC52

4-Amino-1-methyl-3-propylpyrazole-5-carboxamide
CAS:139756-02-8
Sildenafil Amino Amide Impurity
SDF34

4-Amino-1-�-D-arabinofuranosyl-5-methylpyrimidin-2(1H)-one
CAS:6829-31-8
Cytarabine EP Impurity I
CTB09

4-Amino-1-�-D-ribofuranosyl-1,3,5-triazin-2(1H)-one
CAS:320-67-2
Azacitidine
AZC00

4-Amino-1-�-D-ribofuranosylpyrimidin-2(1H)-one
CAS:65-46-3
Molnupiravir IP Impurity D Cytidine
MNP54

4-Amino-1-�-D-ribofuranosylpyrimidin-2(1H)-one
CAS:65-46-3
Cytarabine EP Impurity E Cytidine
CTB05

4-AMINO-2-(1,3-DIOXO-1,3-DIHYDROISOBENZOFURAN-4-YL)ISOINDOLINE-1,3-DIONE
CAS:1795373-50-0
Pomalidomide Impurity 5 Pomalidomide Isobenzofura
PLD75B

4-Amino-2-(2,6-dioxo-3-piperidinyl)isoindole-1,3-dione
CAS:19171-19-8
Pomalidomide 4-Amino Thalidomide
PLD00B

4-AMINO-2-(2,6-DIOXOPIPERIDIN-3-YL)-5-HYDROXYISOINDOLINE-1,3-DIONE
CAS:1547162-41-3
Pomalidomide Impurity 2 4-Amino 5-Hydroxy Thalido
PLD72B

4-AMINO-2-(2,6-DIOXOPIPERIDIN-3-YL)-5-HYDROXYISOINDOLINE-1,3-DIONE
CAS:1547162-41-3
Thalidomide 4-Amino-5-Hydroxy Impurity Pomalidomi
TLD45

4-Amino-2-(bromomethyl)phenylboronic acid
Tavaborole Impurity 2
TVB62

4-AMINO-2-(TRIFLUOROMETHYL)BENZONITRILE
CAS:654-70-6
Enzalutamide Impurity 28
EZL88

4-AMINO-2-(TRIFLUOROMETHYL)BENZONITRILE
CAS:654-70-6
Bicalutamide EP Impurity D
BCL04

4-Amino-2-[(1S)-1-(3 ,4-dihydroxyphenyl)-2-(methylsulfonyl)ethyl]-1H-isoindole-1,3(2H)-dione
CAS:1384439-80-8
Apremilast N-Desacetyl O4-Desmethyl O3-Desethyl Im
APM61

4-AMINO-2-CHLORO-6,7-DIMETHOXYQUINAZOLINE
CAS:23680-84-4
Doxazosin EP Impurity F Doxazosin USP RC C Alfuz
DXZ06

4-AMINO-2-CHLORO-6,7-DIMETHOXYQUINAZOLINE
CAS:23680-84-4
Prazosin EP Impurity A Terazosin EP Impurity A A
PRZ01

4-AMINO-2-CHLORO-6,7-DIMETHOXYQUINAZOLINE
CAS:23680-84-4
Terazosin EP Impurity A Prazosin EP Impurity A A
TRZ01

4-Amino-2-chloro-N-(4,6-dimethylpyrimidin-2-yl)benzenesulfonamide
Sulfadimidine 2-Chloro Impurity
SDD52

4-AMINO-2-CHLOROBENZENESULFONAMIDE
CAS:1954-94-5
Hydrochlorothiazide Impurity 3
HCT63

4-AMINO-2-CHLOROBENZOIC ACID
CAS:2457-76-3
Procaine RC 3
PCE63

4-AMINO-2-CHLOROBENZOYL CHLORIDE
CAS:769864-93-9
Procaine RC 5 (Base)
PCE65B

4-Amino-2-chlorobenzoyl chloride hydrochloride
CAS:58979-43-4
Procaine RC 5 (HCl)
PCE65H

4-AMINO-2-FLUORO-N-METHYLBENZAMIDE
CAS:915087-25-1
Enzalutamide Impurity 3
EZL63

4-AMINO-2-HYDROXYBENZOIC ACID
CAS:65-49-6
Mesalazine EP Impurity E 4-Aminosalicylic Acid
MSL05

4-AMINO-2-METHOXY-5-(METHYLSULFONYL)BENZOIC ACID
CAS:71675-99-5
Amisulpride RC 2
ASD52

4-AMINO-2-METHOXY-5-(METHYLTHIO)BENZOIC ACID
CAS:71675-98-4
Amisulpride RC 1
ASD51

4-AMINO-2-METHYL-10H-THIENO[2,3-B][1,5]BENZODIAZEPINE HCL
CAS:138564-60-0
Olanzapine Amine Impurity
OLZ14H

4-Amino-2-methylamino-5-(3,4,5-trimethoxybenzyl)pyrimidine
CAS:213745-86-9
Trimethoprim EP Impurity A N2-Methyl Trimethoprim
TMM01

4-AMINO-2-METHYLPHENYLBORONIC ACID
CAS:216060-08-1
Tavaborole Impurity 1
TVB61

4-AMINO-2-PHENYLPHENOL
CAS:19434-42-5
Levocloperastine APP Impurity
LCP30

4-AMINO-2-PROPOXYBENZOIC ACID
CAS:2486-79-5
Procaine RC 2
PCE62

4-AMINO-3-BUTOXYBENZOIC ACID
CAS:23442-22-0
Oxybuprocaine EP Impurity B
OXP02

4-Amino-3-chloro-N-(4,6-dimethylpyrimidin-2-yl)benzenesulfonamide
Sulfadimidine 3-Chloro Impurity
SDD53

4-AMINO-3-HYDROXYBENZOIC ACID
CAS:2374-03-0
Oxybuprocaine EP Impurity C Tafamidis RC 2
OXP03

4-AMINO-3-HYDROXYBENZOIC ACID
CAS:2374-03-0
Tafamidis RC 2 Oxybuprocaine EP Impurity C
TFD02

4-AMINO-3-ISOBUTYL-1-METHYL-1H-PYRAZOLE-5-CARBOXAMIDE
CAS:268204-00-8
Sildenafil RC 2
SDF52

4-Amino-3-isobutyl-1H-pyrazole-5-carboxylic acid
CAS:1093415-88-3
Sildenafil RC 40
SDFD0

4-Amino-3-isoxazolidinone (+/-)-3-Oxoisooxazolidin-4-amine
CAS:68-39-3
Cycloserine Racemate
CSR52

4-AMINO-5,6-DICHLOROBENZENE-1,3-DISULFONAMIDE
CAS:5250-72-6
Hydrochlorothiazide Impurity 1 (Base)
HCT61B

4-Amino-5,6-dichlorobenzene-1,3-disulfonamide hydrochloride
CAS:1329838-65-4
Hydrochlorothiazide Impurity 1 (HCl)
HCT61H

4-AMINO-5-(3,4,5-TRIMETHOXYBENZYL)PYRIMIDIN-2-OL
CAS:60729-91-1
Trimethoprim EP Impurity E Trimethoprim USP RC A
TMM05

4-AMINO-5-(ETHYLSULFONYL)-2-METHOXY-N-(2-PYRROLIDINYLMETHYL)BENZAMIDE
CAS:93839-82-8
Amisulpride RC 5
ASD55

4-Amino-5-(ethylsulfonyl)-2-methoxybenzoic acid 2-Methoxy-4-amino-5-ethylsulfonylbenzoic Acid
CAS:71675-87-1
Amisulpride EP Impurity E
ASD05

4-AMINO-5-BROMO-2-METHOXYBENZOIC ACID
CAS:35290-97-2
Bromopride Impurity C
BPX53

4-Amino-5-bromo-N-(2-(diethylamino)ethyl)-2-hydroxybenzamide hydrobromide
Bromopride O-Desmethyl
BPX60H

4-Amino-5-bromo-N-(2-(diethylamino)ethyl)-2-methoxybenzamide
CAS:4093-35-0
Bromopride
BPX00

4-AMINO-5-BROMO-N-[2-(ETHYLAMINO)ETHYL]-2-METHOXYBENZAMIDE
CAS:67903-51-9
Bromopride Desethyl
BPX50

4-Amino-5-chloro-2,3-dihydro-N-[1-(3-methoxypropyl)-1-oxido-4-piperidinyl]-7-benzofurancarboxamide
CAS:1900715-98-1
Prucalopride-N-Oxide
PRC54

4-AMINO-5-CHLORO-2,3-DIHYDROBENZOFURAN-7-CARBOXAMIDE
CAS:182808-16-8
Prucalopride RC 5
PRC65

4-AMINO-5-CHLORO-2,3-DIHYDROBENZOFURAN-7-CARBOXYLIC ACID
CAS:123654-26-2
Prucalopride RC 3
PRC63

4-AMINO-5-CHLORO-2-METHOXYBENZOIC ACID
CAS:7206-70-4
Metoclopramide EP Impurity C Metoclopramide BP Im
MCA03

4-AMINO-5-CHLORO-2-METHOXYBENZOIC ACID
CAS:7206-70-4
Clebopride EP Impurity A Metoclopramide EP Impuri
CBP01

4-Amino-5-chloro-3-hydroxy-N-(1-(3-methoxypropyl)piperidin-4-yl)-2,3-dihydrobenzofuran-7-carboxamide
Prucalopride Hydroxy Impurity
PRC50

4-AMINO-5-CHLORO-N-(1-(3-METHOXYPROPYL)PIPERIDIN-4-YL)-2,3-DIHYDROBENZOFURAN-7-CARBOXAMIDE
CAS:1900715-96-9
Prucalopride RC 4 Dehydro Prucalopride
PRC64

4-Amino-5-chloro-N-(2-(ethylamino)ethyl)-2-methoxybenzamide
CAS:27260-19-1
Metoclopramide N-Desethyl
MCA50

4-AMINO-5-CHLORO-N-(PIPERIDIN-4-YL)-2,3-DIHYDROBENZOFURAN-7-CARBOXAMIDE
CAS:137211-64-4
Prucalopride N-Desmethoxypropyl Impurity
PRC51

4-AMINO-5-CHLORO-N-[1-(3-METHOXYPROPYL)PIPERIDIN-4-YL]-2,3-DIHYDRO-1-BENZOFURAN-7-CARBOXAMIDE
CAS:179474-81-8
Prucalopride (Base)
PRC00B

4-Amino-5-chloro-N-[1-(3-methoxypropyl)piperidin-4-yl]-2,3-dihydro-1-benzofuran-7-carboxamide succinate
CAS:179474-85-2
Prucalopride (Succinate)
PRC00S

4-AMINO-5-CHLORO-N-[2-(DIETHYLAMINO)ETHYL]-2-HYDROXYBENZAMIDE
CAS:38339-95-6
Metoclopramide EP Impurity F Metoclopramide BP Im
MCA06B

4-Amino-5-chloro-N-[2-(diethylamino)ethyl]-2-hydroxybenzamide HCl
CAS:38059-78-8
Metoclopramide EP Impurity F (HCl) Metoclopramide
MCA06H

4-AMINO-5-CHLORO-N-[2-(DIETHYLAMINO)ETHYL]-2-METHOXYBENZAMIDE
CAS:364-62-5
Metoclopramide (Base)
MCA00B

4-Amino-5-chloro-N-[2-(diethylamino)ethyl]-2-methoxybenzamide hydrochloride
CAS:7232-21-5
Metoclopramide (HCl)
MCA00H

4-Amino-5-chloro-N-[2-(diethylamino)ethyl]-2-methoxybenzamide hydrochloride monohydrate
CAS:54143-57-6
Metoclopramide (HCl Monohydrate)
MCA00X

4-AMINO-5-FLUORO-1-(2,3-DI-O-ACETYL-A-D-RIBOFURANOSYL)-2(1H)-PYRIMIDINONE
Capecitabine Descarbamate Diacetyl alpha-Isomer D
CPC65

4-Amino-5-fluoro-1-(2,3-di-O-acetyl-�-D-ribofuranosyl)-2(1H)-pyrimidinone 2',3'-Di-O-acetyl-5'-deoxy-5-fluoro-N4- (pentyloxycarbonyl) cytidine
CAS:162204-20-8
Capecitabine EP Impurity G Capecitabine Diacetyl
CPC07

4-Amino-5-fluoro-1-(2-((((5-fluoro-1-(2-(hydroxymethyl)-1,3-oxathiolan-5-yl)-2-oxo-1,2-dihydropyrimidin-4-yl)amino)methoxy)methyl)-1,3-oxathiolan-5-yl)pyrimidin-2(1H)-one
Emtricitabine N,O-Methylene Dimer
EMT69

4-Amino-5-fluoro-1-(2-(((5-fluoro-1-(2-(hydroxymethyl)-1,3-oxathiolan-5-yl)-2-oxo-1,2-dihydropyrimidin-4-ylamino)methoxy)methyl)-1,3-oxathiolan-5-yl)pyrimidin-2(1H)-one
CAS:1962114-96-0
Emtricitabine FT3
EMT63

4-Amino-5-fluoro-1-[(2R,3R,5S)-2-(hydroxymethyl)-3-oxo-1,3-oxa-?4-thiolan-5-yl]pyrimidin-2(1H)-one
Emtricitabine IP Impurity H Emtricitabine Sulfoxi
EMT58

4-Amino-5-fluoro-1-[(2R,3S,5S)-2-(hydroxymethyl)-3-oxo-1,3-oxa-?4-thiolan-5-yl]pyrimidin-2(1H)-one
Emtricitabine IP Impurity G Emtricitabine Sulfoxi
EMT57

4-Amino-5-fluoro-1-[(2R,5R)-2- (hydroxymethyl)-1,3-oxathiolan-5-yl]-2-(1H)-pyrimidone
CAS:145986-26-1
Emtricitabine 5-Epimer Emtricitabine (2R,5R)-Isom
EMT85

4-Amino-5-fluoro-1-[(2R,5S)-2- (hydroxymethyl)-1,3-oxathiolan-5-yl]-2-(1H)-pyrimidone
CAS:143491-57-0
Emtricitabine
EMT00

4-Amino-5-fluoro-1-[(2R,5S)-2- (hydroxymethyl)-3-oxido-1,3-oxathiolan-5-yl]-2-(1H)-pyrimidone
CAS:152128-77-3
Emtricitabine Sulfoxide
EMT50

4-Amino-5-fluoro-1-[(2RS,5RS)-2- (hydroxymethyl)-1,3-oxathiolan-5-yl]-2-(1H)-pyrimidone
Emtricitabine IP Impurity B trans-Emtricitabine R
EMT52

4-Amino-5-fluoro-1-[(2S,4S)-2-(hydroxymethyl)-1,3-dioxolan-4-yl]pyrimidin-2(1H)-one
CAS:145397-26-8
Emtricitabine IP Impurity J Emtricitabine Dioxola
EMT60

4-Amino-5-fluoro-1-[(2S,5R)-2-(hydroxymethyl)-1,3-oxathiolan-5-yl]-2-(1H)-pyrimidone
CAS:137530-41-7
Emtricitabine IP Impurity D Emtricitabine Enantio
EMT54

4-Amino-5-fluoro-1-[(2S,5S)-2- (hydroxymethyl)-1,3-oxathiolan-5-yl]-2-(1H)-pyrimidone
CAS:145416-34-8
Emtricitabine 2-Epimer
EMT82

4-AMINO-5-FLUORO-3-[6-(1-PIPERAZINYL)-1H-BENZIMIDAZOL-2-YL]-2(1H)-QUINOLINONE
CAS:668432-44-8
Dovitinib N-Desmethyl Analog
DVT51

4-Amino-5-fluoro-3-[6-(4-methyl-1-piperazinyl)-1H-benzimidazol-2-yl]-2(1H)-quinolinone
CAS:405169-16-6
Dovitinib
DVT00B

4-Amino-5-fluoro-3-[6-(4-methyl-1-piperazinyl)-1H-benzimidazol-2-yl]-2(1H)-quinolinone 2-hydroxypropanoate
CAS:692737-80-7
Dovitinib Lactate
DVT00L

4-Amino-5-fluoro-3-[6-(4-methyl-1-piperazinyl)-1H-benzimidazol-2-yl]-2(1H)-quinolinone 2-hydroxypropanoate monohydrate
CAS:915769-50-5
Dovitinib Lactate Monohydrate
DVT00X

4-AMINO-5-FLUOROPYRIMIDIN-2(1H)-ONE
CAS:2022-85-7
Emtricitabine IP Impurity E 5-Fluoro Cytosine
EMT55

4-AMINO-5-FLUOROPYRIMIDIN-2(1H)-ONE
CAS:2022-85-7
Flucytosine 5-Fluoro Cytosine
FCT00

4-Amino-5-methyl-1-�-D-ribofuranosylpyrimidin-2(1H)-one
CAS:2140-61-6
Cytarabine EP Impurity G 5-Methylcytidine
CTB07

4-AMINO-6,7-DIMETHOXY-1,2-DIHYDROQUINAZOLIN-2-ONE
CAS:664347-52-8
Doxazosin USP RC G (Base)
DXZ27B

4-AMINO-6,7-DIMETHOXY-1,2-DIHYDROQUINAZOLIN-2-ONE HYDROCHLORIDE
CAS:134749-43-2
Doxazosin USP RC G (HCl)
DXZ27H

4-AMINO-6,7-DIMETHOXY-2-(1-PIPERAZINYL)QUINAZOLINE
CAS:60547-97-9
Terazosin EP Impurity C (Base) Terazosin USP RC A
TRZ03B

4-AMINO-6,7-DIMETHOXY-2-(1-PIPERAZINYL)QUINAZOLINE
CAS:60547-97-9
Prazosin EP Impurity C Terazosin EP Impurity C D
PRZ03

4-Amino-6,7-dimethoxy-2-(1-piperazinyl)quinazoline dihydrochloride
CAS:60548-08-5
Terazosin EP Impurity C (2HCl) Terazosin USP RC A
TRZ03H

4-AMINO-6,7-DIMETHOXY-2-(4-FORMYL-1-PIPERAZINYL)QUINAZOLINE
CAS:102714-74-9
Terazosin EP Impurity D (Base)
TRZ04B

4-Amino-6,7-dimethoxy-2-(4-formyl-1-piperazinyl)quinazoline HCl
CAS:84050-21-5
Terazosin EP Impurity D (HCl)
TRZ04H

4-AMINO-6-(ISOPROPYLAMINO)-1,3,5-TRIAZIN-2-OL
CAS:19988-24-0
Atrazine Hydroxy Desethyl Impurity
ARZ53

4-AMINO-6-(TRIFLUOROMETHYL)BENZENE-1,3-DISULFONAMIDE
CAS:654-62-6
Bendroflumethiazide EP Impurity A
BFT01

4-AMINO-6-CHLOROBENZENE-1,3-DISULFONAMIDE
CAS:121-30-2
Altizide EP Impurity A Hydrochlorothiazide EP Imp
AZD01

4-AMINO-6-CHLOROBENZENE-1,3-DISULFONAMIDE
CAS:121-30-2
Hydrochlorothiazide EP Impurity B Hydrochlorothia
HCT02

4-AMINO-6-CHLOROBENZENE-1,3-DISULFONIC ACID
CAS:99418-26-5
Hydrochlorothiazide Impurity 4
HCT64

4-AMINO-6-CHLOROBENZENE-1,3-DISULFONYL DICHLORIDE
CAS:671-89-6
Hydrochlorothiazide Impurity 8
HCT68

4-Amino-6-methyl-1H-[1,3,5] triazin-2-one
CAS:16352-06-0
Decitabine 6-Methyl Impurity
DCT36

4-Amino-6-tert-butyl-1,2,4-triazine-3,5(2H,4H)-dione
CAS:56507-37-0
Metribuzin Diketo Impurity
MTB53

4-Amino-6-tert-butyl-3-(methylthio)-1,2,4-triazin-5(4H)-one
CAS:21087-64-9
Metribuzin
MTB00

4-Amino-7-hydroxy-10-methylpteroylglutamic acid
CAS:5939-37-7
Methotrexate 7-Hydroxy Metabolite 7-Hydroxy Metho
MTX57

4-Amino-a-(3-amino-3-oxopropyl)-1,3-dihydro-1,3-dioxo-2H-isoindole-2-acetic acid
CAS:2635-64-5
Pomalidomide Hydrolyzed M11
PLD51B

4-Amino-N'-hydroxybenzamidine
CAS:277319-62-7
Dabigatran RC 10
DBG80B

4-AMINO-N-((2R,3S)-3-AMINO-2-HYDROXY-4-PHENYLBUTYL)-N-ISOBUTYLBENZENESULFONAMIDE
CAS:169280-56-2
Darunavir Diamino Impurity
DRV62

4-AMINO-N-(1-BENZYLPIPERIDIN-4-YL)-2-METHOXYBENZAMIDE
Clebopride EP Impurity C
CBP03

4-Amino-N-(1-benzylpiperidin-4-yl)-5-chloro-2-methoxybenzamide acid (RS)-2-hydroxybutanedioate
CAS:57645-91-7
Clebopride Malate
CBP00M

4-amino-N-(2,6-dimethoxypyrimidin-4-yl)benzene-1-sulfonamide
CAS:122-11-2
Sulfadimethoxine
SDM00

4-Amino-N-(2-(diethylamino)ethyl)benzamide
CAS:51-06-9
Procainamide
PCA00B

4-AMINO-N-(2-(DIETHYLAMINO)ETHYL)BENZAMIDE HYDROCHLORIDE
CAS:614-39-1
Procainamide HCl
PCA00H

4-Amino-N-(2-(diethylamino)ethyl)benzamide N-oxide dihydrochloride
Procainamide N-Oxide (2HCl)
PCA50H

4-Amino-N-(2-hydroxy-6-methoxypyrimidin-4-yl)benzene-1-sulfonamide
CAS:19868-00-9
Sulfadimethoxine EP Impurity F
SDM06

4-AMINO-N-(3,4-DIMETHYL-5-ISOXAZOLYL)BENZENESULFONAMIDE
CAS:127-69-5
Sulfafurazole Sulfisoxazole
SFZ00

4-AMINO-N-(3-METHYLISOXAZOL-5-YL)BENZENESULFONAMIDE
CAS:17103-52-5
Sulfamethoxazole EP Impurity F Sulfamethoxazole U
SMZ06

4-Amino-N-(4,6-dimethyl-2-pyrimidinyl)benzenesulfonamide sodium
CAS:1981-58-4
Sulfadimidine Sodium Sulfamethazine Sodium
SDD00N

4-Amino-N-(4,6-dimethylpyrimidin-2-yl)benzene sulfonamide
CAS:57-68-1
Sulfadimidine Sulfadimezine Sulfadimerazine Sul
SDD00B

4-AMINO-N-(4-METHYL-2-PYRIMIDINYL)BENZENESULFONAMIDE
CAS:127-79-7
Sulfadimidine EP Impurity A Sulfamerazine
SDD01

4-AMINO-N-(4-METHYL-2-PYRIMIDINYL)BENZENESULFONAMIDE
CAS:127-79-7
Sulfamerazine Sulfadimidine EP Impurity A
SMR00

4-AMINO-N-(5,6-DIMETHOXYPYRIMIDIN-4-YL)BENZENESULFONAMIDE
CAS:5018-23-5
Sulfadoxine RC 1
SDX61

4-AMINO-N-(5,6-DIMETHOXYPYRIMIDIN-4-YL)BENZENESULFONAMIDE
CAS:2447-57-6
Sulfadoxine
SDX00

4-AMINO-N-(5-BROMO-4,6-DIMETHYLPYRIMIDIN-2-YL)BENZENESULFONAMIDE
CAS:116-45-0
Sulfadimidine RC 2 Sulfabrom
SDD62

4-AMINO-N-(5-BROMO-4,6-DIMETHYLPYRIMIDIN-2-YL)BENZENESULFONAMIDE
CAS:729-99-7
Sulfadiazine RC 1 Sulfamoxole
SDZ61

4-Amino-N-(5-hydroxy-2-pyridinyl)benzenesulfonamide
CAS:50930-57-9
Sulfapyridine 5-Hydroxy Impurity
SFR50

4-AMINO-N-(5-METHYLISOXAZOL-3-YL)BENZENESULFONAMIDE
CAS:723-46-6
Sulfamethoxazole
SMZ00

4-Amino-N-(6-hydroxy-5-methoxypyrimidin-4-yl)benzenesulfonamide
CAS:1346604-08-7
Sulfadoxine O-Desmethyl
SDX53

4-AMINO-N-(PYRIDIN-2-YL)BENZENESULFONAMIDE
CAS:144-83-2
Sulfapyridine Sulfasalazine EP Impurity J
SFR00

4-AMINO-N-(PYRIDIN-2-YL)BENZENESULFONAMIDE
CAS:144-83-2
Sulfasalazine EP Impurity J Sulfapyridine
SSZ10

4-AMINO-N-[(1-ETHYL-2-PYRROLIDINYL)METHYL]-5-(ETHYLSULFONYL)-2-METHOXYBENZAMIDE
CAS:71675-85-9
Amisulpride
ASD00

4-Amino-N-[(3RS)-1-ethylpiperidin-3-yl]-5-(ethylsulfonyl)-2-methoxybenzamide
CAS:148516-68-1
Amisulpride EP Impurity G
ASD07

4-Amino-N-[[(2RS)-1-ethyl-1-oxidopyrrolidin-2-yl]methyl]-5-(ethylsulfonyl)-2-methoxybenzamide
CAS:71676-01-2
Amisulpride EP Impurity F Amisulpride N-Oxide
ASD06

4-Amino-N-[[(2RS)-1-ethylpyrrolidin-2-yl]methyl]-2-methoxy-5-(methylsulfonyl)benzamide
CAS:71676-00-1
Amisulpride EP Impurity D S-Desethyl S-Methyl Ami
ASD04

4-Amino-N-[[(2RS)-1-ethylpyrrolidin-2-yl]methyl]-5-(ethylsulfonyl)-2-hydroxybenzamide
CAS:148516-54-5
Amisulpride EP Impurity B (Base) Desmethyl Amisul
ASD02B

4-Amino-N-[[(2RS)-1-ethylpyrrolidin-2-yl]methyl]-5-(ethylsulfonyl)-2-hydroxybenzamide HBr
Amisulpride EP Impurity B (HBr) Desmethyl Amisulp
ASD02H

4-Amino-N-[[(2RS)-1-ethylpyrrolidin-2-yl]methyl]-5-(ethylsulfonyl)-2-methoxy-N-methylbenzamide
CAS:1391054-22-0
Amisulpride EP Impurity H N-Methyl Amisulpride
ASD08

4-Amino-N-[[(2RS)-1-ethylpyrrolidin-2-yl]methyl]-5-iodo-2-methoxybenzamide
CAS:176849-91-5
Amisulpride EP Impurity C
ASD03

4-AMINO-N-PYRIMIDIN-2-YLBENZENESULFONAMIDE
CAS:68-35-9
Sulfadimidine EP Impurity B Sulfadiazine
SDD02

4-AMINOANASTROZOLIUM BROMIDE
CAS:906813-01-2
Anastrozole Impurity 1
ANS61

4-AMINOBENZENE-1-SULFONAMIDE
CAS:63-74-1
Sulfadimethoxine EP Impurity E Sulfadiazine EP Im
SDM05

4-AMINOBENZENE-1-SULFONIC ACID
CAS:121-57-3
Sulfadimethoxine EP Impurity D Sulfadiazine EP Im
SDM04

4-AMINOBENZENESULFONAMIDE
CAS:63-74-1
Sulfamethoxazole EP Impurity E Sulfanilamide
SMZ05

4-AMINOBENZENESULFONAMIDE
CAS:63-74-1
Sulfadimidine EP Impurity D Sulfadiazine EP Impur
SDD04

4-AMINOBENZENESULFONAMIDE
CAS:63-74-1
Sulfadiazine EP Impurity D Sulfadiazine BP Impuri
SDZ04

4-AMINOBENZENESULFONIC ACID
CAS:121-57-3
Sulfadiazine EP Impurity B Sulfadiazine BP Impuri
SDZ02

4-AMINOBENZENESULFONIC ACID
CAS:121-57-3
Mesalazine EP Impurity O Sulfanilic Acid
MSL15

4-AMINOBENZENESULFONIC ACID
CAS:121-57-3
Sulfamethoxazole EP Impurity D Sulfadiazine EP Im
SMZ04

4-AMINOBENZENESULFONIC ACID
CAS:121-57-3
Sulfadimidine EP Impurity F Sulfadimethoxine EP I
SDD06

4-AMINOBENZOIC ACID
CAS:150-13-0
Benzocaine EP Impurity G Tetracaine EP Impurity A
BZC07

4-AMINOBENZOIC ACID
CAS:150-13-0
Oxybuprocaine EP Impurity A Benzocaine EP Impurit
OXP01

4-AMINOBENZOIC ACID
CAS:150-13-0
Tetracaine EP Impurity A Benzocaine EP Impurity G
TCX01

4-AMINOBENZONITRILE
CAS:873-74-5
Dabigatran RC 8
DBG78B

4-AMINOBUTANOIC ACID
CAS:56-12-2
Vigabatrin EP Impurity D
VGB04B

4-AMINOMETHYLBENZOIC ACID
CAS:56-91-7
Tranexamic Acid EP Impurity D Tranexamic Acid USP
TNX04B

4-AMINOPHENOL
CAS:123-30-8
Mesalazine EP Impurity A (Base) Propacetamol EP I
MSL01B

4-AMINOPHENOL
CAS:123-30-8
Paracetamol EP Impurity K Mesalazine EP Impurity
PCM11

4-AMINOPHENOL
CAS:123-30-8
Propacetamol EP Impurity B Paracetamol EP Impurit
PPC02

4-AMINOPHENOL HCL
CAS:51-78-5
Mesalazine EP Impurity A (HCl) Propacetamol EP Im
MSL01H

4-Aminophenyl-N-methyl-methanesulfonamide
CAS:109903-35-7
Sumatriptan Aminophenyl Impurity
SMT34

4-AMINOPYRIMIDIN-2(1H)-ONE
CAS:71-30-7
Lamivudine EP Impurity E Cytosine Gemcitabine EP
LMV05

4-AMINOPYRIMIDIN-2(1H)-ONE
CAS:71-30-7
Gemcitabine EP Impurity A Gemcitabine BP Impurity
GCT01

4-AMINOPYRIMIDIN-2(1H)-ONE
CAS:71-30-7
Cytarabine EP Impurity C Cytosine Lamivudine EP
CTB03

4-BENZYL-5-METHYL-3-PHENYLISOXAZOLE
CAS:139395-94-1
Valdecoxib RC 3
VXB63

4-BENZYLMORPHOLINE
CAS:10316-00-4
Aprepitant RC 2
APP42

4-BENZYLPYRIDINE
CAS:2116-65-6
Pheniramine EP Impurity B
PHM02

4-BROMO-1-CHLORO-2-(4-ETHOXYBENZYL)BENZENE
CAS:461432-23-5
Dapagliflozin Despyranose Bromo Impurity Dapaglif
DPG58

4-BROMO-2-(1,1,1-TRIFLUORO-2-METHYLPROPAN-2-YL)PYRIDINE
CAS:1357476-67-5
Alpelisib RC 4
APB64

4-BROMO-2-CHLOROBENZOIC ACID
CAS:59748-90-2
Mefenamic Acid Impurity 1
MNM61

4-BROMO-2-FLUORO-N-METHYLBENZAMIDE
CAS:749927-69-3
Enzalutamide EP Impurity B
EZL02

4-BROMO-2-FLUOROBENZAMIDE
CAS:292621-45-5
Enzalutamide Impurity 22
EZL82

4-BROMO-2-FLUOROBENZOIC ACID
CAS:112704-79-7
Enzalutamide EP Impurity A
EZL01

4-BROMO-2-FLUOROBENZOIC ACID METHYL ESTER
CAS:179232-29-2
Enzalutamide EP Impurity C
EZL03

4-Bromo-5-pentylbenzene-1,3-diol
CAS:78463-35-1
Olivetol 4-Bromo
OVT53

4-Bromo-6-(trifluoromethoxy)benzothiazol-2-amine
CAS:144631-82-3
Riluzole 4-Bromo Impurity Bromoriluzole (USP)
RLZ54

4-BROMO-N-(PYRIDIN-2-YL)BENZENESULFONAMIDE
CAS:3609-89-0
Sulfasalazine RC 2
SSZ52

4-BROMOBENZO[B]THIOPHENE
CAS:5118-13-8
Brexpiprazole impurity 11
BRX71

4-BUTYL-1,2-DIPHENYLPYRAZOLIDINE-3,5-DIONE
CAS:50-33-9
Suxibuzone EP Impurity A Phenylbutazone
SXB01

4-BUTYL-1,2-DIPHENYLPYRAZOLIDINE-3,5-DIONE
CAS:50-33-9
Phenylbutazone Suxibuzone EP Impurity A
PHB00

4-Butyl-4-(hydroxymethyl)-1,2-diphenyl-1,2-dihydro-4H-pyrazole-3,5-dione
CAS:23111-33-3
Suxibuzone EP Impurity C
SXB03

4-BUTYL-4-HYDROXY-1,2-DIPHENYLPYRAZOLIDINE-3,5-DIONE
CAS:16860-43-8
Phenylbutazone EP Impurity B 4-Hydroxy Phenylbuta
PHB02

4-Butyramido-3-methyl-5-nitrobenzoic acid
CAS:959987-48-5
Telmisartan Impurity 19
TST79

4-CARBOXY-A-METHYLBENZENEACETIC ACID
CAS:67381-50-4
Loxoprofen Impurity 3
LXP63A

4-Carboxybenzenesulfonic acid
CAS:636-78-2
Probenecid EP Impurity A (Acid)
PBN01A

4-Carboxybenzenesulfonic acid potassium salt
CAS:5399-63-3
Probenecid EP Impurity A (Potassium Salt )
PBN01K

4-CHLORO-1,1-DIMETHOXYBUTANE
CAS:29882-07-3
Sumatriptan Chloro Impurity
SMT16

4-CHLORO-1-(4-FLUOROPHENYL)BUTAN-1-ONE
CAS:3874-54-2
Haloperidol Impurity 1
HPR51

4-CHLORO-1-ISOBUTYL-1H-IMIDAZO[4,5-C]QUINOLINE
CAS:99010-64-7
Imiquimod USP RC C Desamino Chloroimiquimod
IQM23

4-CHLORO-10-(3-CHLOROPROPYL)-10H-PHENOTHIAZINE
CAS:859970-31-3
Perphenazine 4-Chloro CPP Impurity
PPZ54

4-Chloro-10-[3-(4-methylpiperazin-1-yl)propyl]-10H-phenothiazine
Prochlorperazine EP Impurity C (Base) Prochlorper
PCR03B

4-Chloro-10-[3-(4-methylpiperazin-1-yl)propyl]-10H-phenothiazine dihydrochloride
CAS:1346602-34-3
Prochlorperazine EP Impurity C (2HCl) Prochlorper
PCR03H

4-CHLORO-10H-PHENOTHIAZINE
CAS:7369-69-9
Prochlorperazine RC 7
PCR67B

4-CHLORO-2,3,5-TRIMETHYLPYRIDINE-1-OXIDE
CAS:109371-20-2
Omeprazole RC 9
OMP69

4-CHLORO-2,3-DIMETHYLPYRIDINE N-OXIDE
CAS:59886-90-7
Rabeprazole RC 3
RBP63

4-Chloro-2-((furan-2-ylmethyl)(nitroso)amino)-5-sulfamoylbenzoic acid
CAS:2708280-93-5
Furosemide N-Nitroso Impurity
FRS48A

4-CHLORO-2-(CHLOROMETHYL)-3-METHYLPYRIDINE
CAS:168167-48-4
Rabeprazole RC 5 (Base)
RBP65B

4-Chloro-2-(chloromethyl)-3-methylpyridine HCl
CAS:152402-97-6
Rabeprazole RC 5 (HCl)
RBP65H

4-CHLORO-2-(CHLOROMETHYL)-3-METHYLPYRIDINE HYDROCHLORIDE
CAS:152402-97-6
Lansoprazole Impurity 5 (HCl)
LSP65H

4-Chloro-2-(furan-2-ylmethylamino)benzoic acid
CAS:74793-12-7
Furosemide RC 3
FRS63A

4-CHLORO-2-[(FURAN-2-YLMETHYL)AMINO]-5-SULFAMOYLBENZOIC ACID
CAS:54-31-9
Furosemide
FRS00

4-CHLORO-2-METHYLBENZOIC ACID
CAS:7/2/7499
Lenalidomide Impurity 39
LLM99

4-CHLORO-2-NITROBENZENESULFONAMIDE
CAS:13852-81-8
Hydrochlorothiazide Impurity 5
HCT65

4-CHLORO-3,5-DIMETHYLPHENOL
CAS:88-04-0
Chloroxylenol
CHX00

4-CHLORO-3-(6-(2-CHLOROPHENYL)-1,2,4,5-TETRAZIN-3-YL)PHENOL
CAS:107573-62-6
Clofentezine Metabolite 2
CFN52

4-chloro-3-(ethoxysulfonyl)benzoic acid
CAS:604787-44-2
Indapamide RC 4
IDP64

4-Chloro-3-(trifluoromethyl)-benzenamine
CAS:320-51-4
Sorafenib EP Impurity C
SRF03

4-CHLORO-3-SULFAMOYLBENZAMIDE
CAS:2455-92-7
Indapamide RC 2 Sulclamide
IDP62

4-CHLORO-3-SULFAMOYLBENZOIC ACID
CAS:1205-30-7
Indapamide RC 1
IDP61

4-Chloro-4-fluoro-N-[(1S)-3-[(3-exo)-3-[3-methyl-5-(1-methylethyl)-4H-1,2,4-triazol-4-yl]-8-azabicyclo[3.2.1]oct-8-yl]-1-phenylpropyl]cyclohexanecarboxamide
CAS:1391048-05-7
Maraviroc 4-Desfluoro 4-Chloro Impurity
MRV57

4-CHLORO-4-METHYL-5-METHYLENE-1,3-DIOXOLAN-2-ONE
CAS:95579-71-8
Olmesartan Impurity 4
OLM64

4-CHLORO-5-(2,3-DICHLOROPHENOXY)-2-NITROANILINE
CAS:118353-04-1
Triclabendazole EP Impurity D
TCD04

4-Chloro-5-[2-[[6-[(2-phenylethyl)amino]hexyl]amino]ethyl]benzene-1,2-diol
Dopexamine EP Impurity F
DPX06

4-CHLORO-5-NITRO-2-(PROPYLTHIO)PYRIMIDINE
Ticagrelor Impurity 4
TCG74

4-CHLORO-5-SULFAMOYL-2-[[((2RS)-TETRAHYDROFURAN-2-YL)METHYL]AMINO]BENZOIC ACID
CAS:4793-38-8
Furosemide EP Impurity F Tetrahydro Furosemide
FRS06

4-CHLORO-6,7-(2-METHOXYETHOXY)-QUINAZOLINE
CAS:183322-18-1
Erlotinib Chloro Impurity
ELT49

4-CHLORO-6-(3-CHLOROPROPOXY)-7-METHOXYQUINAZOLINE
CAS:692059-41-9
Gefitinib RC 9
GFT69

4-CHLORO-6-METHOXY-7-(3-(4-METHYLPIPERAZIN-1-YL)PROPOXY)QUINOLINE-3-CARBONITRILE
CAS:492444-39-0
Bosutinib Impurity 1
BST61

4-CHLORO-6-METHOXY-7-(3-(PIPERIDIN-1-YL)PROPOXY)QUINAZOLINE
CAS:288383-71-1
Tandutinib Impurity 2
TTX52

4-CHLORO-6-METHOXY-7-(3-(PYRROLIDIN-1-YL)PROPOXY)QUINAZOLINE
CAS:199327-69-0
Cediranib 4-Chloro Impurity
CDR50

4-CHLORO-7-((2-(TRIMETHYLSILYL)ETHOXY)METHYL)-7H-PYRROLO[2,3-D]PYRIMIDINE
CAS:941685-26-3
Ruxolitinib RC 1
RLT61B

4-CHLORO-7-(3-CHLOROPROPOXY)-6-METHOXYQUINOLINE-3-CARBONITRILE
CAS:214470-68-5
Bosutinib Impurity 29
BST89

4-CHLORO-7-METHOXYQUINOLINE-6-CARBOXAMIDE
CAS:417721-36-9
Lenvatinib Impurity 1
LVT61

4-CHLORO-7-METHOXYQUINOLINE-6-CARBOXYLIC ACID
CAS:771464-30-3
Lenvatinib Impurity 2
LVT62

4-CHLORO-7-TOSYL-7H-PYRROLO[2,3-D]PYRIMIDINE
CAS:479633-63-1
Tofacitinib Impurity 4
TFC94B

4-CHLORO-7H-PYRROLO[2,3-D]PYRIMIDINE
CAS:3680-69-1
Tofacitinib Impurity 2 (Base) 6-Chloro-7-Deazapur
TFC92B

4-CHLORO-7H-PYRROLO[2,3-D]PYRIMIDINE HCL
CAS:1243346-92-0
Tofacitinib Impurity 2 (HCl) 6-Chloro-7-Deazapuri
TFC92H

4-CHLORO-7H-PYRROLO[2,3-D]PYRIMIDINE SODIUM SALT
CAS:443642-59-9
Tofacitinib Impurity 2 (Sodium) 6-Chloro-7-Deazap
TFC92N

4-Chloro-N,N-dimethyl-2-butanamine
CAS:104614-20-2
Oxomemazine Chloro Impurity (Base)
OXM52B

4-CHLORO-N,N-DIMETHYL-2-BUTANAMINE HYDROCHLORIDE
CAS:31412-48-3
Oxomemazine Chloro Impurity (HCl)
OXM52H

4-Chloro-N,N�-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-5-[[(2S)-2-hydroxypropanoyl]-amino]-2,6-diiodobenzene-1,3-dicarboxamide
Iopamidol EP Impurity H Iopamidol USP RC C 4-Des
IPD08

4-Chloro-N-(2-(2,3-dihydro-1,4-oxazin-4-yl)ethyl)benzamide
Moclobemide 2,3-Didehydro Impurity
MCM52

4-Chloro-N-(2-methyl-1H-indol-1-yl]-3-sulfamoylbenzamide
CAS:63968-75-2
Indapamide EP Impurity B Indapamide USP RC A Deh
IDP02

4-chloro-N-(2-morpholinoethyl n-oxide)benzamide
CAS:64544-24-7
Moclobemide N-Oxide
MCM50

4-CHLORO-N-(2-MORPHOLINOETHYL)BENZAMIDE
CAS:71320-77-9
Moclobemide
MCM00

4-CHLORO-N-(4-METHOXYPHENYL)BENZAMIDE
CAS:4018-82-0
Indomethacin EP Impurity C
IDM03

4-CHLORO-N-(IMIDAZOLIDIN-2-YLIDENE)-6-METHOXY-2-METHYLPYRIMIDIN-5-AMINE
CAS:75438-57-2
Moxonidine
MXN00

4-Chloro-N-[(2RS)-2-methyl-2,3-dihydro-1H-indol-1-yl]-3-sulfamoylbenzamide
CAS:26807-65-8
Indapamide
IDP00

4-Chloro-N-[2-(4-hydroxyphenyl)ethyl]benzamide N-(4-Chlorobenzoyl)tyramine
CAS:41859-57-8
Bezafibrate EP Impurity A
BZF01

4-Chloro-N1-(4-chlorobenzoyl)-N-(4-methoxyphenyl)benzohydrazide
CAS:402849-27-8
Indomethacin EP Impurity F
IDM06

4-CHLOROANILINE
CAS:106-47-8
Proguanil EP Impurity B Chlorhexidine Digluconate
PGN02B

4-CHLOROANILINE
CAS:106-47-8
Chlorhexidine Digluconate EP Impurity P (Base) Pr
CXG16B

4-CHLOROANILINE HCL
CAS:20265-96-7
Chlorhexidine Digluconate EP Impurity P (HCl)
CXG16H

4-Chlorobenzene-1,3-diol 1-Chloro-2,4-dihydroxybenzene
CAS:95-88-5
Phloroglucinol EP Impurity K 4-Chlororesorcinol
PLG11

4-CHLOROBENZHYDROL
CAS:119-56-2
Meclizine EP Impurity B Meclozine EP Impurity B
MCL02

4-CHLOROBENZHYDROL
CAS:119-56-2
Cetirizine 4-Chlorobenzhydrol Impurity (USP) Mecl
CTR40

4-CHLOROBENZOIC ACID
CAS:74-11-3
Indomethacin EP Impurity A Indomethacin USP RC B
IDM01

4-CHLOROBENZOIC ACID
CAS:74-11-3
Acemetacin EP Impurity A Bezafibrate EP Impurity
ACM01

4-CHLOROBENZOIC ACID
CAS:74-11-3
Bezafibrate EP Impurity B Indomethacin EP Impurit
BZF02

4-CHLOROBUTYL 3,4-DIMETHOXYBENZOATE
CAS:69788-75-6
Mebeverine EP Impurity E
MBV05

4-Chloromethyl-2-dimethylaminomethylthiazole dihydrochloride
CAS:140176-74-5
Nizatidine CMT Intermediate (2HCl) Nizatidine Chl
NZT55H

4-CHLOROMETHYL-2-DIMETHYLAMINOMETHYLTHIAZOLE HYDROCHLORIDE
CAS:82586-71-8
Nizatidine CMT Intermediate (HCl) Nizatidine Chlo
NZT55X

4-CHLOROMETHYL-5-METHYL-1,3-DIOXOL-2-ONE
CAS:80841-78-7
Olmesartan Chloromethyl Impurity
OLM54

4-CHLOROPHENYL PHENYLSULFONE
CAS:80-00-2
Dapsone Desamino Chloro Analog Sulphenone Dapson
DPS54

4-CHLOROPICOLINIC ACID
CAS:5470-22-4
Sorafenib RC 4 (Base)
SRF64B

4-CHLOROPICOLINIC ACID HYDROCHLORIDE
CAS:1036648-06-2
Sorafenib RC 4 (HCl)
SRF64H

4-CYANOPYRIDINE
CAS:100-48-1
Isoniazid EP Impurity C Isonicotinonitrile
ISN03

4-CYCLOHEXYLBUTANOIC ACID
CAS:4441-63-8
Phenylbutyrate EP Impurity C Phenylbutyrate USP R
PBR03

4-DECHLORO-4-(4-CHLOROPHENYL) HALOPERIDOL DECANOATE
CAS:1796933-22-6
Haloperidol Decanoate EP Impurity E (Base)
HPD05B

4-Dechloro-4-(4-Chlorophenyl) Haloperidol Decanoate Formate Salt
Haloperidol Decanoate EP Impurity E (Formate)
HPD05F

4-Deoxy-pyridol[1',2'-1,2]imidazo[5,4-c]rifamycin SV
CAS:1316302-12-1
Rifaximin 11-Desmethyl Impurity
RFX61

4-Desmethoxypropoxyl-4-Methoxy Rabeprazole 2-[[(4-Methoxy-3-methyl-2-pyridinyl)methyl]sulfinyl]-1H-benzimidazole
CAS:102804-77-3
Rabeprazole EP Impurity E Rabeprazole 4-Methoxy A
RBP05

4-Desmethoxypropoxyl-4-Methoxy Rabeprazole Sulfide 2-[[(4-Methoxy-3-methyl-2-pyridinyl)methyl]sulfanyl]-1H-benzimidazole
CAS:102804-82-0
Rabeprazole EP Impurity G Rabeprazole 4-Methoxy A
RBP07

4-DIAZO-4H-IMIDAZOLE-5-CARBOXAMIDE
CAS:7008-85-7
Temozolomide EP Impurity D Temozolomide USP RC A
TMZ04

4-Dibenzothiazepin-11-yl-1-piperazinecarboxylic acid 2-(2-hydroxyethoxy) ethyl ester
CAS:1011758-00-1
Quetiapine Carboxylate Impurity
QTP40

4-ETHOXY-3-(1-METHYL-3-PROPYL-7-THIOXO-6,7-DIHYDRO-1H-PYRAZOLO[4,3-D]PYRIMIDIN-5-YL)BENZENE-1-SULFONYL CHLORIDE
CAS:479074-07-2
Sildenafil RC 15
SDFA5

4-Ethoxy-3-(1-methyl-3-propyl-7-thioxo-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid
CAS:1353018-10-6
Sildenafil RC 3
SDF53

4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d] pyrimidin-5-yl)benzene-1-sulfonyl chloride
CAS:139756-22-2
Sildenafil Chlorosulfone Impurity
SDF39

4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d] pyrimidin-5-yl)benzoic acid
CAS:147676-78-6
Sildenafil Carboxylic Acid Impurity
SDF35

4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-N-(2-(1-methylpyrrolidin-2-yl)ethyl)benzenesulfonamide
CAS:268204-07-5
Udenafil Ethoxy Analog Despropoxy Ethoxy Udenafil
UDF52

4-Ethoxy-3-(2-methyl-7-oxo-3-propyl-6,7-dihydro-2H-pyrazolo[4,3-d] pyrimidin-5-yl)benzene-1-sulfonyl chloride
CAS:501120-42-9
Sildenafil Chlorosulfone 2-Methyl Isomer
SDF38

4-Ethoxy-3-(3-isobutyl-1-methyl-7-oxo-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzene-1-sulfonyl chloride
CAS:1467610-68-9
Sildenafil RC 16
SDFA6

4-Ethoxy-3-(5-methyl-4-oxo-7-propyl-3,4-dihydro-imidazo[5,1-f][1,2,4]-triazin-2-yl)benzenesulfonyl chloride
CAS:224789-26-8
Vardenafil Chlorosulfone Impurity
VDF39

4-Ethoxy-3-(7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d] pyrimidin-5-yl) benzene-1-sulfonyl chloride
CAS:139756-31-3
Sildenafil Des(methylpiperazinyl) Chlorosulfone Im
SDF48

4-ETHOXY-3-(MORPHOLIN-2-YL(PHENYL)METHOXY)PHENOL
CAS:140431-50-1
Reboxetine RC 11
RBX71

4-ETHYL-5-FLUOROPYRIMIDINE
CAS:137234-88-9
Voriconazole EP Impurity C (Base)
VRC03B

4-Ethyl-5-fluoropyrimidine HCl
CAS:1391052-89-3
Voriconazole EP Impurity C (HCl)
VRC03H

4-Ethylphenol p-Ethylphenol
CAS:123-07-9
Metacresol EP Impurity K
MCS11

4-FLUORO-2-(HYDROXYMETHYL)PHENOL
CAS:2357-33-7
Tavaborole Impurity 20
TVB80

4-FLUORO-2-(HYDROXYMETHYL)PHENYLBORONIC ACID
CAS:1061223-45-7
Tavaborole Impurity 14
TVB74

4-FLUORO-2-HYDROXYBENZOIC ACID
CAS:345-29-9
Tavaborole Impurity 23
TVB83

4-FLUORO-2-METHYL-1H-INDOL-5-OL
CAS:288385-88-6
Cediranib 4-Fluoro 5-Hydroxy 2-Methylindole
CDR51

4-Fluoro-4-hydroxy-2-methoxy-[1,1-biphenyl]-3-carboxylic acid
Diflunisal Impurity D
DFS04

4-FLUOROBENZO[C][1,2]OXABOROL-1(3H)-OL
CAS:174671-88-6
Tavaborole Impurity 21 Tavaborole 4-Fluoro Isomer
TVB81

4-Fluoronaphthalen-1-yl formate
CAS:1000386-62-8
Duloxetine Impurity 4
DLX64

4-Formylbenzene Sulfonamide
CAS:3240-35-5
Mafenide USP RC A 4-Desaminomethyl 4-Formyl Mafen
MFN21

4-HYDRAZINO-N-METHYLBENZENEMETHANESULFONAMIDE
CAS:139272-29-0
Sumatriptan Hydrazine Impurity (Base)
SMT33B

4-HYDRAZINO-N-METHYLBENZENEMETHANESULFONAMIDE HYDROCHLORIDE
CAS:88933-16-8
Sumatriptan Hydrazine Impurity (HCl)
SMT33H

4-HYDRAZINOBENZOIC ACID
CAS:619-67-0
Deferasirox Hydrazino Impurity
DFR35

4-HYDRAZINYLBENZENESULFONAMIDE
CAS:4392-54-5
Celecoxib Impurity 15 (Base)
CLC65B

4-HYDRAZINYLBENZENESULFONAMIDE HYDROCHLORIDE
CAS:17852-52-7
Celecoxib Impurity 15 (HCl)
CLC65H

4-Hydroxy-1,2-diphenyl-4-[2-(phenylsulfinyl)ethyl]pyrazolidine-3,5-dione
Sulfinpyrazone EP Impurity C
SFP03

4-Hydroxy-1-methyl-7-phenoxyisoquinoline-3-carboxamide
CAS:2243809-28-9
Roxadustat RC 4
RXD64

4-HYDROXY-2-METHYL-2H-1,2-BENZOTHIAZINE-3-CARBOXAMIDE 1,1-DIOXIDE
CAS:24683-25-8
Piroxicam EP Impurity C Piroxicam BP Impurity C
PXC03

4-HYDROXY-2-METHYL-2H-THIENO[2,3-E]1,2-THIAZINE-3-CARBOXAMIDE 1,1-DIOXIDE
CAS:105410-48-8
Tenoxicam EP Impurity G
TXC07

4-Hydroxy-2-methyl-N-(5-methyl-2-thiazolyl)-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide
CAS:71125-38-7
Meloxicam
MLX00

4-HYDROXY-2-METHYL-N-(PYRIDIN-2-YL)-2H-1,2-BENZOTHIAZINE-3-CARBOXAMIDE 1,1-DIOXIDE
CAS:36322-90-4
Piroxicam
PXC00

4-Hydroxy-2-methyl-N-(pyridin-2-yl)-2H-thieno[2,3-e]1,2-thiazine-3-carboxamide 1,1-dioxide
CAS:59804-37-4
Tenoxicam
TXC00

4-Hydroxy-2-methyl-N-ethyl-N�-(5-methyl-1,3-thiazol-2-yl)-2 H-1,2-benzothiazine-3-carbox amide- 1,1-dioxide
CAS:881399-30-0
Meloxicam BP Impurity C N-Ethyl Meloxicam
MLX13

4-Hydroxy-2-methyl-N-methyl-N�-(5-methyl-1,3-thiazol-2-yl)-2H-1,2-benzo thiazine- 3-carboxamide 1,1-dioxide
CAS:892395-41-4
Meloxicam BP Impurity E N-Methyl Meloxicam
MLX15

4-HYDROXY-2-METHYLPHENYLBORONIC ACID
CAS:493035-82-8
Tavaborole Impurity 3
TVB63

4-Hydroxy-2H-1-benzopyran-2-one
CAS:1076-38-6
Warfarin EP Impurity B 4-Hydroxycoumarin
WFR02

4-Hydroxy-3,4-dihydroisoquinoline-2(1H)-carboxamidine
Debrisoquine 4-Hydroxy Impurity (Base)
DQN54B