Clevidipine butyrate Impurity 8 Catalogue D155228 CAS 110962-94-2 M.W 409.26 M.F C19H18Cl2N2O4 Specifications FAQs 3-(2-cyanoethyl) 5-Methyl 4-(2',3'-dichlorophenyl)-2,6-diMethyl-1,4-dihydropyridine-3,5-dicarboxylate