Mometasone Furoate Impurity H is a corticosteroid derivative characterized by a 17ฮฑ-furan-2-ylcarbonyloxy substitution and a 6ฮฑ-hydroxy group, resulting from synthetic pathway oxidation. Its structure retains the 16ฮฑ-methyl and 17ฮฑ-propynyl moieties of mometasone furoate but features a hydroxylated C-6 position, distinguishing it as a degradation byproduct. This impurity serves as an HPLC reference standard for quantifying 6ฮฑ-hydroxy metabolite formation during API synthesis.
