α-(2,3-Dimethylphenyl)-α-methyl-1H-imidazole-5-methanol-d3 is the isotope labelled analog of α-(2,3-Dimethylphenyl)-α-methyl-1H-imidazole-5-methanol (D473780); a reagent in the synthesis of Medetomidine (M203250) which is an α2-adrenergic agonist. Also a sedative and analgesic.