A impureza amida de finerenona (CAS 3046142-41-7) é uma variante amidada relacionada ao processo de finerenona, plausivelmente formada por amidização incompleta, conversão hidrolítica ou reações secundárias em etapas tardias da síntese. Com fórmula molecular C21H24N4O4 e massa molecular de 396,4 g/mol, preserva o núcleo heteroaromático do composto parental e introduz a função carboxamida, que pode modificar polaridade, comportamento de retenção e perfil de impurezas. Sua identificação e quantificação geralmente exigem LC-MS/MS, espectrometria de massas de alta resolução e métodos ortogonais por LC-UV ou HPLC. Como impureza estrutural não nitrosamínica, sua relevância regulatória está ligada ao controle sintético e à especificação de impurezas segundo ICH Q3A e ICH M7.
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