Eltrombopag Impurity 21 é uma substância relacionada ao agonista do receptor de trombopoietina de baixa massa molecular eltrombopag, sendo mais adequadamente interpretada como subproduto sintético ou impureza de प्रक्रिया, estruturalmente definida, e não como simples produto de degradação. Com fórmula molecular C27H27N5O4 e massa molar de 485,54 g/mol, preserva o arcabouço heteroaromático e rico em carboxilatos característico do princípio ativo. Sua avaliação insere-se normalmente em estratégias de controle de impurezas compatíveis com ICH Q3A/Q3B. A caracterização inequívoca exige LC-MS/MS, espectrometria de massas de alta resolução e HPLC ortogonal, frequentemente complementadas por RMN para atribuição estrutural. O nome não indica, por si só, um alerta genotóxico específico, porém a qualificação toxicológica depende da via de formação.
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