4-propyl-1,4-dihydro-2,6-dimethyl-3,5-pyridinedicarboxylic acid diethyl ester, 2,6-Dimethyl-4-propyl-1,4-dihydro-pyridin-3,5-dicarbonsaeure-diaethylester, Diethyl 1,4-dihydro-2,6-dimethyl-4-propylpyridine-3,5-dicarboxylate, 1,4-dihydro-2,6-dimethyl-4-propyl-3,5-pyridinedicarboxylate, 2,6-dimethyl-4-propyl-1,4-dihydro-pyridine-3,5-dicarboxylic acid diethyl ester,