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ACETYLSIMVASTATIN SiMvastatin Acetate 4'-Acetyl Simvastatin SiMvastatin IMpurity-B Simvastatin EP Impurity B Simvastatin Impurity B（EP） Simvastatin Impurity 2（EP-B） (1S,3R,7S,8S,8aR)-8-[2-[(2R,4R)-4-( SiMvastatin IMpurity B (Acetyl SiMvastatin) Simvastatin EP Impurity B (Acetyl Simvastatin) Simvastatin Impurity 2(Simvastatin EP Impurity B) [(1S,3R,7S,8S,8aR)-8-[2-[(2R,4R)-4-acetyloxy-6-oxooxan-2-yl]ethyl]-3,7-dimethyl-1,2,3,7,8,8a-hexahydronaphthalen-1-yl] 2,2-dimethylbutanoate (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 (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 2,2-DiMethylbutanoic Acid (1S,3R,7S,8S,8aR)-8-[2-[(2R,4R)-4-(Acetyloxy)tetrahydro -6-oxo-2H-pyran-2-yl]ethyl]-1,2,3,7,8,8a-hexahydro-3,7-diMethyl-1-naphthalenyl Ester Butanoic acid,2,2-dimethyl-,(1S,3R,7S,8S,8aR)-8-[2-[(2R,4R)-4-(acetyloxy)tetrahydro-6-oxo-2H-pyran-2-yl]ethyl]-1,2,3,7,8,8a-hexahydro-3,7-dimethyl-1-naphthalenylester