Osimertinib Impurity 4 (CAS 1975982-94-5) es una impureza de proceso definida, asociada a la ruta sintética de osimertinib y no a una contaminación inespecífica de formulación. Con fórmula molecular C28H33N7O3 y peso molecular de 515.62 g/mol, pertenece al espacio químico de aminas heteroaromáticas característico de intermedios de inhibidores de quinasas y análogos estructuralmente próximos. Su proximidad estructural al principio activo exige consideración en la cualificación de impurezas y, cuando se detecta a nivel traza, en la evaluación conforme a ICH M7. La identificación y cuantificación suelen requerir LC-MS/MS, LC-MS de alta resolución y métodos ortogonales por LC-UV, con confirmación por RMN.
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