6-Heptenoic acid,7-[4-(4-fluorophenyl)-6-(1-methylethyl)-2-[methyl(methylsulfonyl)amino]-5-pyrimidinyl]-3,5-dihydroxy-,methyl ester, (3R,5S,6E)- , its cas register number is 147118-40-9. It also can be called Rosuvastatin Methyl Ester ; 7-[4-(4-Fluorophenyl)-6-(1-Methylethyl)-2-(N-Methyl-N-Methylsulfonyl-Amino)-Pyrimidin-5-Yl]-3,5-Dihydroxy-Hept-6-Enoic Acid Methyl Ester .