Desloratadin-D5 (HCl-Salz), CAS 2733146-31-9, ist ein deuteriertes Isotopolog des nicht sedierenden trizyklischen Antihistaminikums Desloratadin mit der Formel C19H15D5Cl2N2 und einer Molekülmasse von 352,31 g/mol. Die pentadeuterierte aromatische Seitenkette verschiebt die massenspektrometrischen Signale bei weitgehend identischem chromatographischem Verhalten und ähnlicher Ionisation. Dadurch eignet sich die Substanz als isotopenmarkierter Referenzstandard für Verunreinigungsprofile und Isotopenverdünnungsbestimmungen. Im regulatorischen Kontext werden derartige Analoga in LC-MS/MS- und hochauflösenden MS-Verfahren eingesetzt, um Spuren von Verwandten Substanzen, Abbauprodukten und prozessbedingten Spezies mit hoher Selektivität zu erfassen.
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