Buspiron EP-Impurity B, auch als Buspiron-Spiroammoniumsalz bezeichnet, ist eine quartäre Ammoniumverbindung mit der CAS-Nummer 81461-73-6, der Summenformel C12H19BrN4 und einer Molekülmasse von 299,21 g/mol. Das ionische Spiroammonium-Gerüst kennzeichnet eine strukturell definierte, bromidassoziierte Verunreinigung, die bei der Synthese oder beim Salzaustausch von Buspiron-Zwischenstufen entstehen kann. Da solche kationischen Spezies die Spezifität der Gehaltsbestimmung und das Profil verwandter Substanzen beeinflussen können, erfolgt die Charakterisierung typischerweise mittels LC-MS/MS, Ionenchromatographie und hochauflösender Massenspektrometrie, ergänzt durch NMR zur Struktursicherung. Regulatorisch wird sie als prozessbedingte organische Verunreinigung und nicht als Nitrosamin oder klassische genotoxische Spezies bewertet.
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