A impureza N-Metil de Upadacitinib é um derivado monometilado que pode formar-se por metilação inadvertida durante etapas sintéticas ou por reações de degradação sob condições agressivas. A caracterização analítica normalmente envolve HPLC para determinação de pureza, LC-MS para identificação de massa e RMN para confirmação estrutural, enquanto métodos validados de HPLC-UV permitem quantificação precisa. Sua presença altera o perfil de pureza e estabilidade do lote e exige definição de limites aceitáveis segundo guidelines regulatórias. Estratégias de controle incluem otimização do processo, desenvolvimento de métodos cromatográficos seletivos, estudos de degradação forçada e disponibilidade de padrão de referência para garantir monitoramento e mitigação do risco.
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