isotopically substituted 

https://doi.org/10.1351/goldbook.I03338
Describes a compound that has a composition such that essentially all the molecules of the compound have only the indicated nuclide(s) at each designated position. For all other positions, the absence of nuclide(s) indication means that the nuclide(s) composition is the natural one.
Sources:
Blue Book, p. 514 [Terms] [Book]
PAC, 1981, 53, 1887. (Nomenclature of inorganic chemistry: II.1 - Isotopically modified compounds) on page 1890 [Terms] [Paper]
Citation: 'isotopically substituted' 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.I03338 RIS BibTex EndNote
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Last revised: February 24, 2014