3,5-Pyridinedicarboxylic acid, 1,4-dihydro-2,6-dimethyl-4-(2-methylphenyl)-, ethyl 2-propynyl ester 39562-66-8 Ethyl 2-propynyl 2,6-dimethyl-4-(2-methylphenyl)-1,4-dihydro-3,5-pyridine dicarboxylate