05702 IUPAC Gold Book - singly labelled 10.1351/goldbook.S05702 S05702 current 1 A specifically labelled compound in which the isotopically substituted molecule has only one isotopically modified atom e.g. $\ce{CH3–CH[^{2}H]–OH}$. isotopically modified https://goldbook.iupac.org/terms/view/I03337 isotopically substituted https://goldbook.iupac.org/terms/view/I03338 specifically labelled https://goldbook.iupac.org/terms/view/S05793 Blue Book, p. 515 (https://www.acdlabs.com/iupac/nomenclature/) PAC, 1981, 53, 1887. 'Nomenclature of inorganic chemistry: II.1 - Isotopically modified compounds' on page 1892 (https://doi.org/10.1351/pac198153101887) https://goldbook.iupac.org/terms/view/S05702/html https://goldbook.iupac.org/terms/view/S05702/json https://goldbook.iupac.org/terms/view/S05702/plain 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. 10.1351/goldbook.S05702 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-15T02:31:16+00:00