Brivaracetam Impurity 88, con fórmula molecular C16H8N6 y masa molecular de 284.27 g/mol, es una impureza heteroaromática rica en nitrógeno asociada a la química de síntesis y degradación del andamiaje de brivaracetam. Su baja densidad protónica y la conjugación extendida son compatibles con una especie azaaromática de elevada rigidez estructural, que puede formarse durante la ciclación, la sobreoxidación o la depuración incompleta de intermediarios avanzados. Dado que estas impurezas pueden persistir a nivel traza y presentar una evaluación toxicológica relevante bajo ICH M7, su caracterización suele requerir LC-MS/MS, MS de alta resolución y HPLC ortogonal con detección UV o de matriz de diodos; por lo general no se necesita derivatización.
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