Amlodipine EP Impurity H Catalogue A236738 CAS 318465-73-5 M.W 557.00 M.F C28H29ClN2O8 Specifications FAQs 2-((2-((4-(2-Chlorophenyl)-3-(ethoxycarbonyl)-5-(methoxycarbonyl)-6-methyl-1,4-dihydropyridin-2-yl)methoxy)ethyl)carbamoyl)benzoic acid