Fluprostenol isopropyl ester, a potent agonist of the F-series prostaglandin receptor, serves as a prodrug utilized clinically as an ocular hypotensive agent for glaucoma treatment. An impurity, 13(R),14(R)-epoxy fluprostenol isopropyl ester, arises during its production, existing as a chiral enantiomer of the epoxide. The pharmacological properties of this specific enantiomer have yet to be thoroughly investigated.