4,5-DIHYDRO-1,8-DIMETHYL-4-OXOIMIDAZO[1,2-A]QUINOXALIN-2-CARBOXYLIC ACID ETHYL ESTER CAS:164329-39-9 4,5-DIHYDRO-3-METHYL-4-[2-(4-NITROPHENYL)HYDRAZONO]-5-OXO-1H-PYRAZOLE-1-CARBOXAMIDINE CAS:42541-26-4 |