Levetiracetam EP Impurity B, CAS 358629-47-7, corresponde a un componente definido relacionado con el proceso o la degradación del anticonvulsivante de núcleo pirrolidónico levetiracetam. Con fórmula molecular C8H12N2O2 y peso molecular de 168,19 g/mol, se trata de un heterociclo neutro y polar cuyo perfil fisicoquímico favorece la separación por LC en fase reversa, aunque su similitud estructural con análogos cercanos suele exigir confirmación ortogonal por espectrometría de masas. En estudios farmacopéicos y de perfil de impurezas, su asignación depende habitualmente de LC-MS/MS, LC-MS de alta resolución y, cuando procede, corroboración por RMN. La evaluación regulatoria se centra en su origen en síntesis o almacenamiento y en la cualificación de la impureza.
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