N-Nitroso Eltrombopag Impurity 1 é um degradante relacionado a nitrosaminas de eltrombopague, definido pela N-nitrosação do motivo amina heteroaromático da molécula-mãe. Com fórmula molecular C12H13N3O2 e massa molecular de 231.25 g/mol, trata-se de uma impureza potencialmente genotóxica, de origem processual ou de armazenamento, formada sob condições nitrosantes, especialmente na presença de precursores de aminas secundárias e espécies reativas de nitrito. Essas espécies são avaliadas no contexto regulatório de impurezas de nitrosaminas e dos princípios da ICH M7. A quantificação em traços geralmente requer LC-MS/MS com confirmação por MS de alta resolução e, quando a volatilidade permite, GC-MS para caracterização ortogonal.
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