singly labelled 

https://doi.org/10.1351/goldbook.S05702
A specifically labelled compound in which the isotopically substituted molecule has only one isotopically modified atom e.g. CH3–CH[2H]–OH.
Sources:
Blue Book, p. 515 [Terms] [Book]
PAC, 1981, 53, 1887. (Nomenclature of inorganic chemistry: II.1 - Isotopically modified compounds) on page 1892 [Terms] [Paper]
Citation: 'singly labelled' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S05702 RIS BibTex EndNote
Div. IIDiv. VIIIPDFTextXMLJSON
Last revised: February 24, 2014