Amlodipine EP Impurity K Catalogue A236741 CAS 2170716-02-4 M.W 436.93 M.F C22H29ClN2O5 Specifications FAQs 5-ethyl 3-isopropyl 2-((2-aminoethoxy)methyl)-4-(2-chlorophenyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate