A Impureza 2 associada à epinastina é observada como produto secundário em etapas de síntese e degradação | requerendo caracterização e controle rigorosos. Seu perfil analítico é estabelecido por HPLC com detecção UV para quantificação | LC-MS para determinação da massa molecular e RMN para elucidação estrutural. Mecanismos prováveis incluem reações secundárias ou hidrólise parcial durante etapas críticas | afetando rendimento e pureza teórica. Estratégias de controle envolvem otimização de condições de reação | purificação por cromatografia ou recristalização | e monitorização em estudos de estabilidade. Limites de especificação devem ser definidos conforme guias regulatórios como ICH Q3A e Q3B e avaliados quanto ao potencial risco toxicológico.
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