Synonyms: Simvastatin Imp. A (EP), Tenivastatin Calcium, 1-Naphthaleneheptanoic acid, 8-(2,2-dimethyl-1-oxobutoxy)-1,2,6,7,8,8a-hexahydro-beta,delta-dihydroxy-2,6-dimethyl-, ammonium salt (1:1), (betaR,deltaR,1S,2S,6R,8S,8aR)-, 1-Naphthaleneheptanoic acid, 8-(2,2-dimethyl-1-oxobutoxy)-1,2,6,7,8,8a-hexahydro-beta,delta-dihydroxy-2,6-dimethyl-, monoammonium salt, (betaR,deltaR,1S,2S,6R,8S,8aR)- (9CI), 1-Naphthaleneheptanoic acid, 8-(2,2-dimethyl-1-oxobutoxy)-1,2,6,7,8,8a-hexahydro-beta,delta-dihydroxy-2,6-dimethyl-, monoammonium salt, [1S-[1alpha(betaS*,deltaS*),2alpha,6beta,8beta,8aalpha]]-, Ammonium simvastatin, Simvastatin acid ammonium salt, Simvastatin ammonium salt, Simvastatin carboxylic acid ammonium salt, Simvastatin Impurity A as Ammonium Salt