Rosuvastatin EP Impurity D

Chemical Name: N-[4-(4-fluorophenyl)-5-[(1E)-2-[(2S,4R)-4-hydroxy-6-oxooxan-2-yl]ethen-1-yl]-6-(propan-2-yl)pyrimidin-2-yl]-N-methylmethanesulfonamide (as per EP); N-[4-(4-Fluorophenyl)-5-{(E)-2-[(2S,4R)-4-hydroxy-6-oxotetrahydro-2H-pyran-2-yl]vinyl}-6-isopropylpyrimidin-2-yl]-N-methylmethanesulfonamide (as per USP)

Synonym:  Rosuvastatin Lactone