Chemical Name: Sodium, 4-{6-(4-Fluorophenyl)-7,8-epoxy-6-hydroxy-8a-isopropyl-7-phenyl-8-(phenylcarbamoyl)hexahydro-2H-pyrrolo[2,1-b][1,3]oxazin-2-yl}-3-hydroxybutanoate(as per USP)
Synonym: Atorvastatin Cyclic Isopropyl Impurity ; Atorvastatin FXA Impurity