Ribociclib-Piperazinamid-Verunreinigung, CAS 3056250-51-9, ist eine prozessbedingte Amidverunreinigung, die mit der Piperazin-Seitenkette von Ribociclib assoziiert ist. Die Summenformel C18H26N6O und die Molekülmasse 342,44 g/mol entsprechen einer oxygenierten Strukturvariante, die aus Acylierung oder Amidierung während der Synthese oder aus verwandter Abbauchemie hervorgehen kann. Als nichtklassische Verunreinigung in Spuren, nicht als eigenständiger pharmakologischer Bestandteil, wird sie im Rahmen des Impurity Profiling und, sofern relevant, unter ICH-M7-Aspekten für strukturauffällige Begleitstoffe bewertet. Die Charakterisierung erfordert üblicherweise LC-MS/MS, HRMS und orthogonale HPLC-Verfahren sowie NMR zur Strukturbestätigung.
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