nitemazepam nitemazepam nitemazepam (or 3-hydroxynimetazepam) is a benzodiazepine derivative which was first synthesised in the 1970s but was never marketed. it is the 7-nitro instead of 7-chloro analogue of temazepam, and also the 3-hydroxy derivative of nimetazepam, and an active metabolite. it has in more recent years been sold as a designer drug, first being definitively identified in europe in 2017. it is metabolized to 7-aminonitemazepam, nimetazepam, 3-hydroxynitemazepam, temazepam, and nimetazepam glucuronide. not to be confused with nimetazepam or temazepam. nitemazepamlegal statuslegal status ca: schedule iv de: npsg (industrial and scientific use only) uk: under psychoactive substances act identifiers iupac name 7-nitro-3-hydroxy-5-phenyl-1-methyl-1h-benzo diazepin-2(3h)-one cas number40762-03-6pubchem cid12362353chemspider64854354uniidfj6m9363ochemical and physical dataformulac16h13n3o4molar mass311.297 g·mol−13d model (jsmol)interactive image smiles o=(o)c1ccc2c(c1)c(=nc(o)c(=o)n2c)c3ccccc3 inchi inchi=1s/c16h13n3o4/c1-18-13-8-7-11(19(22)23)9-12(13)14(17-15(20)16(18)21)10-5-3-2-4-6-10/h2-9,15,20h,1h3key:qrwvnmajjiqceg-uhfffaoysa-n