Acetyl Simvastatin ((1S,3R,7S,8S,8aR)-8-{2-[(2R,4R)-4-(acetoxy)-6-oxotetrahydro-2H-pyran-2-yl]ethyl}-3,7-dimethyl-1,2,3,7,8,8a-hexahydronaphthalen-1-yl 2,2-dimethylbutanoate)