Atorvastatin 3-Oxo Atorvastatin tert-Butyl Ester Atorvastatin Impurity 15 Difluoro Atorvastatin Acetonide tert-Butyl Ester 2,3-Dehydroxy Atorvastatin Sodium Salt Atorvastatin Dehydro Lactone Atorvastatin Impurity 20 Atorvastatin IMpurity G 3S,5R isoMer, or (3S,5R)-7-[3-(phenylcarbaMoyl)-5-(4-fluorophenyl)-2-isopropyl-4-phenyl-1H-pyrrol-1-yl]-3,5-dihydroxyheptanoic acid calciuM salt O-Methyl Atorvastatin Calcium Salt Atorvastatin Oxirane Impurity Ortho-Hydroxy atorvastatin calcium salt Atorvastatin Lactam Sodium Salt Impurity Atorvastatin Methyl Ester Atorvastatin Ethyl Ester ATV-FX1 sodiuM salt Dihydroxy Diketo Atorvastatin IMpurity 5-Oxo Atorvastatin tert-Butyl Ester