1,4-Dihydro-2,6-dimethyl-4-(4-nitrophenyl)-3,5-pyridinedicarboxylic acid dimethyl ester 161838-99-9 2,6-Dimethyl-3,5-dicarbomethoxy-4-(4-nitrophenyl)-1,4-dihydropyridine 21829-09-4 3,5-Pyridinedicarboxylic acid, 1,4-dihydro-2,6-dimethyl-4-(4-nitrophenyl)-, dimethyl ester