Prothioconazole-5-Hydroxy desthio HCl is a desulfurized oxidation byproduct of the triazole fungicide prothioconazole, featuring a 5-hydroxy substitution on the triazole ring and a thiazole moiety lacking the sulfur atom. Its structure incorporates a hydroxyl group at the 5-position, a desulfurized thiazole core, and a hydrochloride salt form. This impurity arises via oxidative degradation pathways, reflecting structural instability at the sulfur-containing thiazole linkage. It serves as a critical HPLC reference standard for quantifying degradation products in prothioconazole-based formulations.
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