selectively labelled
An @[email protected] compound is designated as selectively labelled when a mixture of @[email protected] compounds is formally added to the analogous @[email protected] compound in such a way that the position(s) but not necessarily the number of each @[email protected] @[email protected] is defined. A selectively labelled compound may be considered as a mixture of @[email protected] compounds.
Blue Book, p. 515 [Terms] [Book]
PAC, 1981, 53, 1887. (Nomenclature of inorganic chemistry: II.1 - Isotopically modified compounds) on page 1893 [Terms] [Paper]