Specifically labelled

{
  "id": "MLC-T-CHM-011115",
  "term": "Specifically labelled",
  "field": "Chemistry",
  "definition": "Describing a chemical compound in which the position of an isotopic label is precisely known and indicated. This contrasts with uniformly labelled compounds where the isotope is distributed throughout the molecule without a specified position. The specific position of the isotope is denoted by a locant in the chemical name.",
  "subject": "Inorganic Chemistry",
  "see_also": [
    "isotopically labelled",
    "isotopically substituted",
    "isotopically unmodified",
    "labelling",
    "nuclide"
  ],
  "references": [
    "Blue Book, p. 514 (https://www.acdlabs.com/iupac/nomenclature/)",
    "PAC, 1981, 53, 1887. 'Nomenclature of inorganic chemistry: II.1 - Isotopically modified compounds' on page 1891 (https://doi.org/10.1351/pac198153101887)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/specifically-labelled/"
}