A impureza Upadacitinib N1-Methyl Ester é um derivado metílico relevante no perfil de pureza do upadacitinibe, originada por metilação inadvertida do nitrogênio N1 durante etapas sintéticas ou de processamento. Sua presença pode afetar potência, perfil de degradação e riscos toxicológicos, exigindo identificação estruturada por LC-MS/MS e confirmação por RMN. Métodos de controle recomendados incluem cromatografia HPLC validada, testes de linearidade, precisão e limites de detecção, estudos de degradação forçada e estabelecimento de especificações conforme orientações ICH. Estratégias de mitigação contemplam otimização das etapas reacionais, purificação e monitoramento em processo para garantir conformidade regulatória e consistência do lote.
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