Amoxicilloic Acid Dimer, als Mischung von Diastereomeren, auch als Amoxicilloic Amoxilloic Acid Dimers 1, 2, 3 und 4 bezeichnet, CAS 297175-66-7, ist ein penicillansäurebasiertes Dimer mit Bezug zur hydrolytischen Abbauchemie von Amoxicillin. Die Summenformel C31H40N6O9S2 und die Molekülmasse 704,81 g/mol kennzeichnen eine schwefelhaltige, aus einem β-Lactam abgeleitete Verunreinigung mit mehreren Stereozentren und daraus resultierender diastereomerer Komplexität. Die Bildung ist vereinbar mit Verknüpfung der Acylseitenkette nach Ringöffnung des β-Lactams unter wässriger Belastung während Lagerung oder Verarbeitung. Für Nachweis und Gehaltsbestimmung werden typischerweise LC-MS/MS, hochauflösende Massenspektrometrie sowie orthogonale RP- oder chirale LC zur Isomerentrennung eingesetzt; NMR kann die Strukturzuordnung stützen. Regulatorisch ist der Abbauproduktcharakter relevant.
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