Tofacitinib Impurity 39 (CAS 923036-30-0) es un subproducto sintético relacionado estructuralmente con el principio activo que requiere control analítico riguroso; presenta comportamiento cromatográfico y espectrométrico distintivo que permite su identificación por HPLC con detección UV | LC-MS y confirmación estructural por RMN. Su presencia en trazas puede derivar de rutas de síntesis o degradación y debe evaluarse según guías ICH para impurezas orgánicas; se recomienda definir límites de especificación | validar métodos cuantitativos sensibles | estudiar estabilidad y vías de formación | e implementar medidas de control de proceso para minimizar su nivel en materia prima y formulaciones.
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