Valaciclovir EP Impurity J (CAS 142963-63-1) | conocida también como Acyclovir L-Isoleucinate | es una impureza relacionada observada en lotes de valaciclovir que deriva de reacciones de esterificación incompleta y acoplamiento del fragmento valina. Químicamente identificable por su masa molecular y por fragmentación característica en espectrometría de masas | requiere control analítico riguroso mediante HPLC con detección UV y LC-MS/MS para cuantificación y perfilado. Su presencia por encima de límites especificados puede indicar desviaciones en síntesis o condiciones de almacenamiento. Se recomienda establecer límites de aceptación | métodos de eliminación en purificación y estudios de degradación forzada para garantizar cumplimiento con especificaciones farmacéuticas.
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