n-Octyl β-D-glucopyranoside-d24 is the deuterium labeled Fmoc-L-Val-OH[1].
References
[1] Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019;53(2):211-223. DOI:10.1080/02688697.2018.1500521