N-Nitroso Almotriptan Impurity 9 é uma impureza nitrosada identificada durante o desenvolvimento e controle de qualidade de almotriptano. Caracteriza-se por formação via nitrosação de precursores aminados sob condições de síntese ou armazenamento com presença de nitrito e pH ácido. Seu perfil analítico é definido por LC-MS de alta resolução e HPLC-UV para quantificação | com NMR e HRMS empregues na elucidação estrutural. Estratégias de controle incluem monitoramento de nitritos | otimização de pH | materiais de partida de alta pureza e validação de métodos analíticos. Avaliação toxicológica e limites de aceitação são estabelecidos conforme diretrizes ICH e estudos de estabilidade e degradação.
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