Cetirizin-D4, CAS 1219803-84-5, ist das deuterierte Analogon von Cetirizin mit der Summenformel C21H21D4ClN2O3 und einer Molmasse von 392,9 g/mol. Als stabiles Isotopenreferenzmaterial gehört es zur Klasse der Piperazin-Antihistaminika und dient der Charakterisierung von Massenspektren, Isotopeneffekten und chromatographischem Retentionsverhalten cetirizinbezogener Spezies. Es ist keine strukturelle Verunreinigungsklasse an sich, sondern ein markierter Surrogatstoff für Verunreinigungsprofile und Abbauuntersuchungen. Die Bestimmung erfolgt typischerweise mittels LC-MS/MS oder hochauflösender LC-MS, da die vier Deuteriumatome die exakte Masse verschieben, bei weitgehend erhaltener Chemie, und so eine selektive Verfolgung in komplexen Matrizes ermöglichen.
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