Roxadustat Impurity 5 (CAS 1455091-04-9) é uma impureza estruturalmente relacionada ao Roxadustat que exige monitoramento preciso durante desenvolvimento e controle de qualidade. Apresenta propriedades físico-químicas que podem influenciar solubilidade, comportamento cromatográfico e perfil de degradação do lote. Sua identificação e quantificação dependem de técnicas analíticas avançadas, incluindo LC-MS/MS, HPLC com detecção PDA e espectrometria de massa de alta resolução, apoiadas por padrões de referência e métodos validados por parâmetros de seletividade, linearidade e robustez. Estudos de degradação forçada, avaliação toxicológica, estabelecimento de limites conforme ICH Q3A e estratégias de remoção no processo são essenciais para garantir conformidade regulatória e integridade do produto.
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