2H-1,4-Benzodiazepin-2-one, 7-chloro-1-[2-(ethylsulfonyl)ethyl]-5-(2-fluorophenyl)-1,3-dihydro- 52042-01-0 7-Chloro-1-[2-(ethylsulfonyl)ethyl]-5-(o-fluorophenyl)-1,3-dihydro-2H-1,4-benzodiazepin-2-one Elfazepam NSC297938 SK&F 72517