Impureza 9-Oxo Epinastine (HCl) | CAS 141342-69-0 | é um subproduto oxidativo identificado no processo de síntese e durante estudos de estabilidade do epinastine. Apresenta massa molecular compatível com oxidação da amina | polaridade aumentada e solubilidade em meio aquoso ácido. Monitoramento por HPLC com detecção UV | LC-MS e RMN é recomendado para quantificação e caracterização estrutural. Estratégias de controle incluem otimização de condições redox | uso de antióxidantes e purificação por cromatografia. Limites de aceitação devem ser definidos conforme ICH Q3A/Q3B com base em toxicidade e exposição. Dados de estabilidade orientam especificações de armazenamento e shelf life.
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