15-epi Travoprost is a stereoisomeric impurity generated via epimerization at the C-15 position of the cyclopentyl ring in the parent prostaglandin analog. This structural inversion alters the spatial configuration of the adjacent hydroxyl group while preserving the fluorinated side chain, ฮณ-lactone core, and ester functionality. The compound exhibits distinct chromatographic and spectroscopic properties compared to the parent drug, necessitating its quantification in API synthesis. It functions as a reference standard for HPLC-based impurity profiling in Travoprost drug substance characterization.
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InChI=1S/C26H35F3O6/c1-17(2)35-25(33)11-6-4-3-5-10-21-22(24(32)15-23(21)31)13-12-19(30)16-34-20-9-7-8-18(14-20)26(27,28)29/h3,5,7-9,12-14,17,19,21-24,30-32H,4,6,10-11,15-16H2,1-2H3/b5-3-,13-12+/t19-,21+,22+,23-,24+/m0/s1
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