Lercanidipine Dimethyl Ester Impurity

Chemical Name: 1,4-Dihydro-2,6-dimethyl-4-(3-nitrophenyl)-3,5-pyridinedicarboxylic Acid 3,5-Dimethyl Ester; BAY-a 4339; Dimethyl 4-(m-nitrophenyl)-2,6-dimethyl-1,4-dihydro-3,5- pyridinedicarboxylate;