Desfluoro Fosaprepitant dimeglumine is a structural analog of the neurokinin-1 (NK1) receptor antagonist prodrug, Fosaprepitant, presented as a bis-meglumine salt. This impurity variant features a modification within the parent drug's trifluoromethyl group, likely involving the replacement of one fluorine atom with hydrogen, resulting in a difluoromethyl substituent. The compound retains the core phosphate ester linkage to the morpholine-substituted triazole system. Its formation can occur via specific synthetic side reactions or as a degradation product of Fosaprepitant. It functions as a critical reference standard for the chromatographic identification and quantification of related substances in Fosaprepitant active pharmaceutical ingredient.
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