Epinastine EP Impurity B | identificado también como 7-Bromo Epinastine (HBr) | es una impureza bromada que surge como subproducto de síntesis o por halogenación durante procesos de fabricación y estudio de estabilidad. Su perfil fisicoquímico y espectral se caracteriza por un incremento en la masa molecular y señales específicas en LC-MS y RMN | y se monitoriza rutinariamente mediante HPLC-UV para cuantificación precisa. El control de esta impureza es crítico para cumplimiento de monografías farmacopéicas y seguridad analítica | por lo que se recomienda optimizar condiciones de reacción | aplicar pasos de purificación dirigidos y validar límites de aceptación en estudios de perfil de impurezas.
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