Atorvastatin EP Impurity O (Calcium) Catalogue A325315 CAS 887196-30-7 M.W 556.62 M.F C33H33FN2O5 Specifications FAQs (5R)-7-[3-(Phenylcarbamoyl)-5-(4-fluorophenyl)-2-isopropyl-4-phenyl-1H-pyrrol-1-yl]-5-hydroxy-3-oxo-heptanoic acid calcium salt ;CAS # 887196-30-7 (Acid) ;C33H33FN2O5 (Acid) ; Mol. Wt.: 556.62 ;C33H32FN2O5. 1/2 Ca ; Mol. Wt.: 575.66 ;