Atorvastatin EP Impurity A Catalogue A325301 CAS 433289-83-9 M.W 559.68 M.F C33H35N2O5 . 1/2 Ca (Ca Salt) Specifications FAQs (3R,5R)-7-[3-(Phenylcarbamoyl)-5-phenyl-2-isopropyl-4-phenyl-1H-pyrrol-1-yl]-3,5-dihydroxyheptanoic acid calcium salt ;433289-83-9 (calcium salt) ; 433289-84-0 (acid) ;