ETHYL 8-ETHYL-5,6,7,8-TETRAHYDRO-2-METHOXY-5-OXOPYRIDO[2,3-D]PYRIMIDINE-6-CARBOXYLATE CAS:65269-20-7 ETHYL 8-ETHYL-5,8-DIHYDRO-5-OXO-2-(PYRROLIDINYL)PYRIDO[2,3-D]PYRIMIDINE-6-CARBOXYLATE CAS:33836-43-0 |