Regorafenib EP Impurity E (CAS 2098799-13-2) é uma impureza relacionada ao princípio ativo que exige monitorização rigorosa devido à sua complexidade estrutural e impacto na pureza do lote. Identificada por técnicas analíticas como HPLC | LC-MS e RMN | apresenta tempo de retenção e padrões de massa distintos que facilitam sua quantificação e caracterização. Sua formação está associada a reações secundárias no processo sintético | incluindo acoplamentos incompletos e modificações durante etapas de purificação. O controlo inclui limites de aceitação definidos | padrões de referência | validação de métodos analíticos e otimização do processo para minimizar sua presença e garantir conformidade regulamentar.
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