Impureza ciclizada de Upadacitinib (CAS 1708997-42-5) identificada como derivado intramolecular formado durante etapas de síntesis o por degradación en condiciones ácidas o de calor. Su caracterización exige técnicas analíticas precisas, incluyendo HPLC con detección UV, LC-MS para masa exacta y RMN para confirmación estructural. La presencia de esta impureza puede afectar el perfil de seguridad y la potencia del material activo, por lo que es crítico definir límites de especificación, desarrollar métodos indicativos de estabilidad y procedimientos de purificación adecuados. Estrategias de control recomendadas abarcan monitorización de lote, uso de estándares de referencia y optimización de condiciones de síntesis.
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