15-Hydroxy Lubiprostone

15-Hydroxy Lubiprostone is a structurally modified derivative of the parent bicyclic lactone Lubiprostone, featuring an additional hydroxyl group at the C15 position of the perhydroindole core. This hydroxylation introduces a polar functional group adjacent to the tetrahydrofuran ring and fluorinated side chain, altering intermolecular interactions and metabolic stability. The compound arises as a synthetic byproduct during late-stage fluorination steps or via oxidative degradation pathways. Its distinct hydroxyl moiety enables specific detection in impurity profiling, serving as an HPLC reference standard for quantifying process-related impurities in Lubiprostone drug substance batches.