3-hydroxyphenazepam 3-hydroxyphenazepam 3-hydroxyphenazepam is a benzodiazepine with hypnotic, sedative, anxiolytic, and anticonvulsant properties. it is an active metabolite of phenazepam, as well as the active metabolite of the benzodiazepine prodrug cinazepam. relative to phenazepam, 3-hydroxyphenazepam has diminished myorelaxant properties, but is about equivalent in most other regards. like other benzodiazepines, 3-hydroxyphenazepam behaves as a positive allosteric modulator of the benzodiazepine site of the gabaa receptor with an ec50 value of 10.3 nm. it has been sold online as a designer drug. 3-hydroxyphenazepamclinical dataatc codenonelegal statuslegal status ca: schedule iv de: npsg (industrial and scientific use only) uk: under psychoactive substances act identifiers iupac name 7-bromo-5-(2-chlorophenyl)-3-hydroxy-1,3-dihydro-2h-1,4-benzodiazepin-2-one cas number70030-11-4pubchem cid125820chemspider111897unii1kj8mp77jkcomptox dashboard (epa)dtxsid10990281 chemical and physical dataformulac15h10brcln2o2molar mass365.61 g·mol−13d model (jsmol)interactive image smiles c1ccc(c(c1)c2=nc(c(=o)nc3c2cc(cc3)br)o)cl inchi inchi=1s/c15h10brcln2o2/c16-8-5-6-12-10(7-8)13(19-15(21)14(20)18-12)9-3-1-2-4-11(9)17/h1-7,15,21h,(h,18,20)key:krjkjuwazowxnv-uhfffaoysa-n