3-Metl-D-histidine-d3 drochloride is the deuterium labeled 3-Metl-D-histidine drochloride. 3-Metl-D-histidine drochloride can be found in actin and myosin and is a derivative of histidine.
References:
[1]. Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019;53(2):211-216.
[2]. White WJ, Lawrie RA. Variations in the levels of 3-metl-l-histidine of the myosins within the bovine carcass. Meat Sci. 1985;15(3):173-81.