La impureza del análogo Isoquinolinona de Fenilefrina (Phenylephrine Isoquinolinone Analog) representa un subproducto estructural relevante por su impacto en la pureza y seguridad del lote; su identificación suele basarse en técnicas analíticas avanzadas como HPLC-UV para perfil de impurezas | LC-MS para masa exacta y fragmentación | y RMN para confirmación estructural. Se origina típicamente por ciclización intramolecular o reacciones secundarias durante la etapa de construcción de la isoquinolinona | y puede afectar estabilidad y toxicidad. El control exige optimización de condiciones de síntesis | purificación por HPLC preparativa o recristalización y establecimiento de límites aceptables conforme a guías regulatorias ICH | junto con métodos validados de cuantificación.
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