Atorvastatin Epoxy Tetrahydrofuran Analog

4-(4-Fluorophenyl)-2,4-dihydroxy-2-isopropyl-N,5-diphenyl-3,6-dioxabicyclo [3.1.0]hexane-1-carboxamide; Dihydroxy Atorvastatin; Atorvastatin dihydroxy Diepoxide; Atorvastatin Epoxy THF Analog; Atorvastatin Calcium - Impurity D ; 4-(4-Fluorophenyl)-2,4-dihydroxy-2-isopropyl-N,5-diphenyl-3,6-dioxabicyclo[3.1.0]hexane-1-carboxamide (USP)