115951-92-3 3,5-Pyridinedicarboxylic acid, 1,4-dihydro-2,6-dimethyl-4-(2-(2-nitrophenyl)ethenyl)-, dimethyl ester Dimethyl 2,6-dimethyl-4-(2-(2-nitrophenyl)ethenyl)-1,4-dihydro-3,5-pyridinedicarboxylate