Clevidipine butyrate Impurity 5 Catalogue D155225 CAS 2458150-60-0 M.W 456.32 M.F C21H23Cl2NO6 Specifications FAQs 3-((butyryloxy)methyl) 5-methyl 4-(3,4-dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate