Medetomidine-d4 is an intermediate in the synthesis of Dexmedetomidine-d4 L-Tartrate (d4-Major) (D299006). Dexmedetomidine-d4 L-Tartrate is the labeled salt analogue of Dexmedetomidine (D299000), an α2-Adrenergic agonist; (+)-isomer of Medetomidine; sedative; analgesic.