normethadone normethadone normethadone (inn, ban; brand names cophylac, dacartil, eucopon, mepidon, noramidone, normedon, and others), also known as desmethylmethadone or phenyldimazone, is a synthetic opioid analgesic and antitussive agent. normethadone is listed under the single convention on narcotic drugs 1961 and is a schedule i narcotic controlled substance in the united states, with a dea acscn of 9635 and an annual manufacturing quota of 2 grams. the salts in use are the hydrobromide (free base conversion ratio 0.785), hydrochloride (0.890), methyliodide (0.675), oxalate (0.766), picrate (0.563), and the 2,6-ditertbutylnapthalindisulphonate (0.480). not to be confused with normethandrone. normethadoneclinical datatrade namescophylacatc coder05da06 (who) legal statuslegal status au: s9 (prohibited substance) ca: schedule i de: anlage iii (special prescription form required) us: schedule i identifiers iupac name 6-dimethylamino-4,4-diphenyl-hexan-3-one cas number467-85-6 n 847-84-7 (hcl)pubchem cid10090chemspider9687 yuniikr2l2a68xlkeggd07384 ychemblchembl346331 ycomptox dashboard (epa)dtxsid6057748 echa infocard100.006.730 chemical and physical dataformulac20h25nomolar mass295.426 g·mol−13d model (jsmol)interactive image smiles o=c(c(c1ccccc1)(c2ccccc2)ccn(c)c)cc inchi inchi=1s/c20h25no/c1-4-19(22)20(15-16-21(2)3,17-11-7-5-8-12-17)18-13-9-6-10-14-18/h5-14h,4,15-16h2,1-3h3 ykey:wcjfbsyalhqbsk-uhfffaoysa-n y ny (what is this?) (verify)