elfazepam elfazepam elfazepam is a drug which is a benzodiazepine derivative. presumably it has sedative and anxiolytic actions like those of other benzodiazepines. elfazepamclinical dataatc codenoneidentifiers iupac name 7-chloro-1-(2-ethylsulfonylethyl)-5-(2-fluorophenyl)-3h-1,4-benzodiazepin-2-one cas number52042-01-0 ypubchem cid65445chemspider58907 yuniirm53r5r2blcomptox dashboard (epa)dtxsid00200008 chemical and physical dataformulac19h18clfn2o3smolar mass408.87 g·mol−13d model (jsmol)interactive image smiles o=s(cc)(ccn1c(cn=c(c2=cc=cc=c2f)c3=c1c=cc(cl)=c3)=o)=o inchi inchi=1s/c19h18clfn2o3s/c1-2-27(25,26)10-9-23-17-8-7-13(20)11-15(17)19(22-12-18(23)24)14-5-3-4-6-16(14)21/h3-8,11h,2,9-10,12h2,1h3 ykey:bspsxmxqkzznfp-uhfffaoysa-n y (verify) orexigenic properties in animals. the mechanism for increasing feed intake is not clear and has been subject of investigation. it has been found that elfazepam suppresses gastric acid secretion. synthesis elfazepam synthesis: u.s. patent 4,010,154 benzophenone derivative 1 is reacted with a glycine equivalent masked as an oxazolidine-2,5-dione 2 to give the final product 3 elfazepam.