N-Nitroso Valsartan Desvaleryl Impurity, también denominada N-Nitroso Valsartan Impurity, es una impureza de proceso y de degradación relacionada con nitrosaminas en análogos desvalerilo de valsartán. Con fórmula molecular C19H20N6O3 y peso molecular 380.40 g/mol, incorpora el andamiaje tetrazólico nitrosado característico de valsartán y presenta relevancia toxicológica en el marco de ICH M7 y de la evaluación regulatoria de nitrosaminas. Su formación puede producirse por condiciones nitrosantes durante la síntesis o el almacenamiento en presencia de precursores de aminas secundarias. La determinación a niveles traza suele requerir LC-MS/MS, LC-MS de alta resolución o GC-MS complementaria debido a la baja exposición permitida y a la similitud estructural con impurezas afines.
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