Levetiracetam EP Impurity B, CAS 358629-47-7, bezeichnet eine definierte prozess- oder abbauassoziierte Verunreinigung im Umfeld des pyrrolidonbasierten Antikonvulsivums Levetiracetam. Mit der Summenformel C8H12N2O2 und einer Molekülmasse von 168,19 g/mol handelt es sich um ein neutrales, polares Heterocyclus-System, dessen physikochemisches Verhalten eine Trennung mittels RP-LC begünstigt, jedoch aufgrund enger struktureller Verwandtschaft oft eine orthogonale massenspektrometrische Bestätigung erfordert. In pharmakopöischen und verunreinigungsanalytischen Kontexten erfolgt die Zuordnung typischerweise über LC-MS/MS, hochauflösende LC-MS und gegebenenfalls ergänzende NMR. Regulatorisch steht die Qualifizierung, die herstellungsbedingte Entstehung und eine mögliche Anreicherung während Synthese oder Lagerung im Fokus.
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