fenmetozole fenmetozole fenmetozole (dh-524) is a drug which was patented as an antidepressant, but was later studied as an antagonist of the effects of ethanol, though results were poor and it even increased its effects in some cases. it acts as an α2-adrenergic receptor antagonist similarly to other imidazoles like idazoxan. it was never marketed. fenmetozoleclinical dataatc codenoneidentifiers iupac name 2--4,5-dihydro-1h-imidazole cas number41473-09-0 23712-05-2 (hcl)pubchem cid32049chemspider29721uniic15wfn6gmochemblchembl50472comptox dashboard (epa)dtxsid40194371 chemical and physical dataformulac10h10cl2n2omolar mass245.10 g·mol−13d model (jsmol)interactive image smiles clc2ccc(occ/1=n/ccn\1)cc2cl fenoxazoline has the precise same formula, albeit instead of the 3',4'-dich, an ortho-isopropyl group was chosen instead.