1,4-Dihydro-2,6-dimethyl-4-(3-nitrophenyl)pyridine-3-carboxylic acid-5-carboxylic methyl ester 74936-72-4 EINECS 278-034-2 Methyl hydrogen 1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate