Atorvastatin Calcium Impurity A (Freebase) (As per 35.1 EP Monograph); Desfluoroatorvastatin; (3R,5R)-7-[2,3-Diphenyl-4-(phenylcarbamoyl)-5-(propan-2-yl)-1H-pyrrol-1-yl]-3,5-dihydroxyheptanoic Acid; (3R,5R)-3,5-Dihydroxy-7-[2-(1-methylethyl)-4,5-diphenyl-3-(phenylcarbamoyl)-1H-pyrrol1-yl]heptanoic Acid; (3R,5R)-3,5-Dihydroxy-7-[5-(1-methylethyl)-2,3-diphenyl-4-(phenylcarbamoyl)-1H-pyrrol-1-yl]heptanoic Acid; (3R,5R)-3,5-Dihydroxy-7-(2-isopropyl-4,5-diphenyl-3-(phenylcarbamoyl)-1H-pyrrol-1-yl)heptanoic Acid; (3R,5R)-7-[3-(Phenylcarbamoyl)-5-phenyl-2-isopropyl-4-phenyl-1H-pyrrol-1-yl]-3,5-dihydroxyheptanoic Acid; Defluoroatorvastatin