Valaciclovir EP Impurity J (CAS 142963-63-1) | também referida como Acyclovir L-Isoleucinate | é uma impureza relacionada crítica observada em matérias-primas e produtos acabados de valaciclovir. Sua identificação e quantificação exigem ensaios analíticos robustos | incluindo HPLC com detecção UV | LC-MS e caracterização por RMN | para diferenciar isômeros e confirmar estrutura. Pode originar-se por vias de síntese alternativas ou degradação durante armazenamento | influenciando pureza e perfil de segurança do API. O controle inclui limites especificados | métodos validados | estudo de estabilidade e qualificação conforme ICH Q3A/Q3B para garantir conformidade regulatória e qualidade do lote.
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