Carbon label is a form of isotopic labeling where a carbon-12 atom is replaced with either a stable carbon-13 atom or radioactive carbon-11 or carbon-14 atoms in a chemical compound so as to 'tag' (i.e. label) that position of the compound to assist in determining the way a chemical reaction proceeds i.e. the reaction mechanism.[1]

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  1. ^ Babin, Victor; Sallustrau, Antoine; Loreau, Olivier; Caillé, Fabien; Goudet, Amélie; Cahuzac, Héloïse; Del Vecchio, Antonio; Taran, Frédéric; Audisio, Davide (2021). "A general procedure for carbon isotope labeling of linear urea derivatives with carbon dioxide". Chemical Communications. 57 (54): 6680–6683. doi:10.1039/D1CC02665H. PMID 34132265. S2CID 235450623.