Pantoprazol-EP-Verunreinigung E, auch als Pantoprazol-BP-Verunreinigung E, Pantoprazol Related Compound E oder Pantoprazol-Dimer bezeichnet, ist eine dimerische Bis-Benzimidazol-Spezies aus der Prozesschemie von Pantoprazol und steht im Zusammenhang mit oxidativer Kupplung des Benzimidazol-Sulfoxid-Gerüsts. CAS 2115779-15-0 gehört zu C32H28F4N6O8S2 mit einer Molmasse von 764,72 g/mol. Die Verbindung enthält zwei 3,4-Dimethoxypyridylmethylsulfinyl-Substituenten und zwei Difluormethoxy-Gruppen, was die chromatographische Trennung erschwert. Die Bestimmung erfolgt typischerweise mittels RP-LC-MS oder LC-MS/MS, da UV-Detektion bei niedrigen Gehalten und möglicher Koelution häufig unzureichend ist.
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