2,6-Dimethyl-4-diphenylmethyl-1,4-dihydropyridine-3,5-dicarboxylic acid diethyl ester

diethyl 2,6-dimethyl-4-(1H-pyrrol-2-yl)-1,4-dihydropyridine-3,5-dicarboxylate

triethyl 2,7,8a-trimethyl-1,4,4a,5,8,8a-hexahydro-1,8-naphthyridine-3,4a,6-tricarboxylate