Tetraxetan Related Compound A, sal de trifluoroacetato, é uma impureza relacionada ao processo associada ao arcabouço de tetraxetan, descrita pela fórmula C20H33F3N4O10 e massa molecular de 546.49 g/mol. O contraíon trifluoroacetato indica isolamento na forma salina e pode surgir durante síntese em meio ácido, neutralização, purificação ou cristalização. Pelas suas características estruturais, deve ser tratada no perfil de impurezas e não como contaminação inespecífica. A detecção em nível traço costuma exigir LC-MS/MS e LC-MS de alta resolução, complementadas por HPLC-UV e, quando necessário, caracterização por RMN. A avaliação regulatória deve considerar origem, limites de especificação e possível formação por degradação sob condições de estabilidade.
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