ro20-8552 ro20-8552 ro20-8552 is a benzodiazepine derivative with sedative and anxiolytic effects, which has been sold as a designer drug. ro20-8552legal statuslegal status ca: schedule iv de: npsg (industrial and scientific use only) uk: under psychoactive substances act identifiers iupac name 8-chloro-5-(2-fluorophenyl)-7-methyl-1,3-dihydro-1,4-benzodiazepin-2-one pubchem cid44366138chemspider23222080chemblchembl356411chemical and physical dataformulac16h12clfn2omolar mass302.73 g·mol−13d model (jsmol)interactive image smiles cc1=cc2=c(c=c1cl)nc(=o)cn=c2c3=cc=cc=c3f inchi inchi=1s/c16h12clfn2o/c1-9-6-11-14(7-12(9)17)20-15(21)8-19-16(11)10-4-2-3-5-13(10)18/h2-7h,8h2,1h3,(h,20,21)key:gankbgrugxcjbg-uhfffaoysa-n