Amlodipine EP Impurity E Catalogue A236735 CAS 400024-12-6 M.W 422.91 116.07 M.F C21H27ClN2O5. C4H4O4 Specifications FAQs CAS:140171-65-9 (free base)Synonyms:Diethyl 2-((2-aminoethoxy)methyl)-4-(2-chlorophenyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate