Impureza conocida como Leflunomide Metabolite Ethyl Analog (CAS 2734292-21-6) representa un derivado etílico del metabolito activo de leflunomida que puede formarse durante la síntesis o el almacenamiento. Su presencia afecta la pureza farmacéutica y requiere control riguroso por HPLC y espectrometría de masas para identificación y cuantificación. Se describen propiedades físicoquímicas relevantes para la separación cromatográfica y potenciales rutas de degradación que influyen en perfiles de estabilidad. La evaluación de límites aceptables | métodos validados de análisis y estudios de riesgo imparten soporte para decisiones de liberación de lote y cumplimiento regulatorio en desarrollo y control de calidad.
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