Epinastine Impurity 9 es una impureza relevante dentro del perfil de impurezas de la síntesis de epinastina | cuya identificación y caracterización son esenciales para el control de calidad. Presenta comportamiento cromatográfico distintivo con tiempo de retención reproducible y patrones de fragmentación específicos en LC-MS que facilitan su detección cuantitativa. Su presencia sugiere vías de degradación o reacciones secundarias en la etapa intermedia | por lo que se evalúan niveles | límites de aceptación y posibles rutas de formación. Los análisis se realizan conforme a guías ICH y métodos validados para establecer especificaciones | estrategias de eliminación y criterios de calificación en desarrollo farmacéutico.
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