Rosuvastatin EP Impurity A t-Butyl Ester

Chemical Name: S-Desmethyl-S-(2-Hydroxy-2-Methylpropyl) Rosuvastatin t-Butyl Ester ; (3R,5S,6E)-7-[4-(4-Fluorophenyl)-6-(1-methylethyl)-2-[methyl (2-hydroxy-2-methylpropylsulfonyl)amino]-5-pyrimidinyl]-3,5-dihydroxy- 6-heptenoic acid t-butyl ester

Smile: FC(C=C1)=CC=C1C2=C(/C=C/[C@@H](O)C[C@@H](O)CC(OC(C)(C)C)=O)C(C(C)C)=NC(N(C)S(=O)(CC(C)(O)C)=O)=N2