4,4′-Dibromo diphenyl ether-13C12 is 13C labeled 4,4'-Oxybis(bromobenzene)[1].
References
[1] Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019 Feb;53(2):211-216. DOI:10.1177/1060028018797110
