3,5-Pyridinedicarboxylic acid, 1,4-dihydro-4-(3-nitrophenyl)-1,2,6-trimethyl-, methyl 1-methylethyl ester 50698-13-0 Isopropyl methyl 1,2,6-trimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate