21881-54-9 3,5-Pyridinedicarboxylic acid, 1,4-dihydro-2,6-dimethyl-4-(p-nitrophenyl)-, diethyl ester 5-22-04-00271 (Beilstein Handbook Reference) BRN 0350245 Diethyl 2,6-dimethyl-4-(p-nitrophenyl)-1,4-dihydro-3,5-pyridinedicarboxylate