2,6-Dimethyl-3,5-dimethoxycarbonyl-4-(o-difluoromethylsulfonylphenyl)-1,4-dihydropyridine 3,5-Pyridinedicarboxylic acid, 1,4-dihydro-4-(o-((difluoromethyl)sulfonyl)phenyl)-2,6-dimethyl-, dimethyl ester 84761-74-0