La impurificación amida de upadacitinib es una impureza orgánica relacionada con el proceso, coherente con una amidación o una reorganización hidrolítica del núcleo heteroaromático del compuesto original, sin pertenecer a una clase estructural asociada a alertas genotóxicas directas. Con fórmula molecular C15H18N6O y peso molecular de 298.34 g/mol, corresponde a un degradante definido o subproducto de síntesis que puede formarse durante etapas de acoplamiento tardío, exposición a humedad o reacciones de amidación. Su caracterización suele requerir LC-MS/MS para confirmación de masa, junto con LC-UV y espectrometría de masas de alta resolución para discriminar análogos cercanos. La evaluación regulatoria sigue principios de calificación de impurezas.
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