21829-15-2 3,5-Pyridinedicarboxylic acid, 1,4-dihydro-4-(p-aminophenyl)-2,6-dimethyl-, diethyl ester 4-(4'-Aminophenyl)-2,6-dimethyl-3,5-dicarbethoxy-1,4-dihydropyridine Diethyl 1,4-dihydro-4-(p-aminophenyl)-2,6-dimethyl-3,5-pyridinedicarboxylate