2,6-Dimethyl-3,5-dimethoxycarbonyl-4-(p-difluoromethoxyphenyl)-1,4-dihydropyridine 3,5-Pyridinedicarboxylic acid, 1,4-dihydro-4-(4-(difluoromethoxy)phenyl)-2,6-dimethyl-, dimethyl ester 84761-71-7