Salmeterol EP Impurity A

Rosuvastatin EP Impurity A (Calcium Salt) ; Rosuvastatin USP RC A ; S-Desmethyl-S-(2-Hydroxy-2-Methylpropyl) Rosuvastatin Calcium ; (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 calcium salt ;