Atorvastatin Epoxy Tetrahydrofuran Analog

Atorvastatin Epoxy Tetrahydrofuran Analog is a structurally modified derivative of atorvastatin, featuring an epoxy-substituted tetrahydrofuran ring in place of the native lactone moiety. This analog retains the pyrrole-fused indole core and 4-fluorophenyl substituent characteristic of the parent drug but incorporates a strained three-membered epoxy group fused to a five-membered tetrahydrofuran ring, altering hydrophobicity and hydrogen-bonding capacity. The compound arises as a synthetic byproduct during lactone ring modification processes. This impurity serves as a reference standard for HPLC-based quantification of atorvastatin process-related impurities.