Buspirone EP Impurity J, auch als Buspirone Open Ring Spirodimer Impurity bezeichnet, CAS 2726492-72-2, ist eine prozessbedingte dimerische Verunreinigung des spirozyklischen Azapiron-Gerüsts von Buspiron. Die Summenformel C34H52N6O5 und die Molekülmasse von 624,81 g/mol kennzeichnen eine hochmolekulare, nicht flüchtige Spezies, die aus Kupplungsreaktionen, Ringöffnungsprozessen oder verwandten degradativen Umlagerungen während der Synthese oder Lagerung entstehen kann. Für die Strukturaufklärung sind in der Regel hochauflösende LC-MS/MS-Methoden und ergänzende NMR-Daten erforderlich, da eine konventionelle HPLC-UV-Detektion für die Spurenzuordnung oft nicht ausreicht. Als keine Nitrosaminverbindung ist sie dennoch im Rahmen pharmakopöischer Verunreinigungsprofile und der ICH-Q3A-Bewertung relevant.
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