specifically labelled

https://doi.org/10.1351/goldbook.S05793
An @I03336@ compound is designated as specifically labelled when a unique @I03338@ compound is formally added to the analogous @I03339@ compound. In such a case, both position(s) and number of each @L03425@ @N04257@ are defined.
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]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
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Last revised: February 24, 2014