Clevidipine butyrate Impurity 6 Catalogue D155226 CAS 1898262-47-9 M.W 470.34 M.F C22H25Cl2NO6 Specifications FAQs 3-((butyryloxy)methyl) 5-ethyl 4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate