Synonyms: Simvastatin Imp. B (EP), Acetyl Simvastatin, (1S,3R,7S,8S,8aR)-8-[2-[(2R,4R)-4-(Acetyloxy)-6-oxotetrahydro-2H-pyran-2-yl]ethyl]-3,7-dimethyl-1,2,3,7,8,8a-hexahydronaphthalen-1-yl 2,2-Dimethylbutanoate, Simvastatin Acetate Ester, Simvastatin Impurity B