Synonyms: 1,1-Dimethylethyl (4R-cis)-6-[2-[2-(4-Fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1-H-pyrrol-1-yl]ethyl]-2,2-di-methyl-1,3-dioxane-4-acetate, Atorvastatin Related Compound I, Atorvastatin Calcium Impurity I, Atorvastatin Impurity I