3-Ethylphenylboronic acid-d5 (B-(3-Ethylphenyl)-Boronic acid-d5) is a deuterium labeled 3-Ethylphenylboronic acid.
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