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Ro05-4082 structure.png
Legal status
Legal status
  • 5-(2-chlorophenyl)-1-methyl-7-nitro-3H-1,4-benzodiazepin-2-one
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass329.74 g·mol−1
3D model (JSmol)
  • CN1C(=O)CN=C(C2=C1C=CC(=C2)[N+](=O)[O-])C3=CC=CC=C3Cl
  • InChI=1S/C16H12ClN3O3/c1-19-14-7-6-10(20(22)23)8-12(14)16(18-9-15(19)21)11-4-2-3-5-13(11)17/h2-8H,9H2,1H3

Ro05-4082 (N-methylclonazepam, ID-690) is a benzodiazepine derivative developed in the 1970s. It has sedative and hypnotic properties, and has around the same potency as clonazepam itself.[1] It was never introduced into clinical use. It is a structural isomer of meclonazepam (3-methylclonazepam), and similarly has been sold as a designer drug, first being identified in Sweden in 2017.[2]

See also[edit]


  1. ^ Fukuda H, Kudo Y, Ono H, Togari A, Tanaka Y (January 1977). "[Pharmacological study on 5-(o-chlorophenyl)-1-methyl-7-nitro-1,3-dihydro-2H-1,4-benzodiazepin-2-one (ID-690), with special reference to the effects on motor systems]". Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica (in Japanese). 73 (1): 123–34. doi:10.1254/fpj.73.123. PMID 558942.
  2. ^ "Novel Benzodiazepines. A review of the evidence of use and harms of Novel Benzodiazepines" (PDF). Advisory Council on the Misuse of Drugs. April 2020.