acetoxymethylketobemidone acetoxymethylketobemidone acetoxymethylketobemidone (o-amkd), is an opioid designer drug related to ketobemidone, with around the same potency as morphine. it was first identified in germany in october 2020. acetoxymethylketobemidoneidentifiers iupac name acetate cas number878895-45-5pubchem cid155907596unii5m56jwt3cpchemical and physical dataformulac16h21no3molar mass275.348 g·mol−13d model (jsmol)interactive image smiles cc(=o)c1(ccn(cc1)c)c2=cc(=cc=c2)oc(=o)c inchi inchi=1s/c16h21no3/c1-12(18)16(7-9-17(3)10-8-16)14-5-4-6-15(11-14)20-13(2)19/h4-6,11h,7-10h2,1-3h3key:zxpasxbvyvtlrg-uhfffaoysa-n