Atorvastatin EP Impurity M Catalogue A325313 CAS 1146977-93-6 M.W 586.69 M.F C35H39FN2O5 Specifications FAQs Atorvastatin Acid Ethyl Ester ; (3R,5R)-7-[3-(Phenylcarbamoyl)-5-(4-fluorophenyl)-2-isopropyl-4-phenyl-1H-pyrrol-1-yl]-3,5-dihydroxyheptanoic acid ethyl ester ; CAS # 1146977-93-6