Rosuvastatin EP Impurity B

Rosuvastatin EP Impurity B (Calcium Salt) ; (3RS,5RS,6E)-7-[4-(4-Fluorophenyl)-6-(1-methylethyl)-2-[methyl (methyl sulfonyl)amino]-5-pyrimidinyl]-3,5-dihydroxy- 6-heptenoic acid calcium salt ;