isotopically labelled

https://doi.org/10.1351/goldbook.I03336
Describes a mixture of an @[email protected] compound with one or more analogous @[email protected] compound(s).
Sources:
Blue Book, p. 514 [Terms] [Book]
PAC, 1981, 53, 1887. (Nomenclature of inorganic chemistry: II.1 - Isotopically modified compounds) on page 1891 [Terms] [Paper]