Cabozantinib Impurity 1 ist eine definierte prozessbedingte verwandte Substanz des Multikinase-Inhibitors Cabozantinib mit der Summenformel C56H49F2N6O10 und einer Molekülmasse von 1004,02 g/mol. Die Struktur weist ein stark substituiertes, lipophiles aromatisches Gerüst mit mehreren Heteroatomen und Carbonylfunktionen auf, was eher auf ein späte Synthesezwischenprodukt oder ein oxidatives Kupplungsprodukt als auf einen einfachen Abbauhinweis schließen lässt. Aufgrund der Komplexität und der erwarteten geringen Konzentration sind zur Charakterisierung üblicherweise LC-MS/MS, hochauflösende Massenspektrometrie sowie orthogonale LC-UV- oder NMR-Bestätigung erforderlich. Im regulatorischen Impurity-Profiling wird eine solche Spezies hinsichtlich Strukturzuordnung, Bildungsweg und toxikologischer Relevanz bewertet.
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