Clinical data
ATC code
  • None
  • (±)-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-N-(1-piperidinyl)-4,5-dihydro-1H-pyrazole-3-carboxamide
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass451.78 g·mol−1
3D model (JSmol)
  • O=C(NN1CCCCC1)\C4=N\N(c2ccc(Cl)cc2Cl)C(c3ccc(Cl)cc3)C4
  • InChI=1S/C21H21Cl3N4O/c22-15-6-4-14(5-7-15)20-13-18(21(29)26-27-10-2-1-3-11-27)25-28(20)19-9-8-16(23)12-17(19)24/h4-9,12,20H,1-3,10-11,13H2,(H,26,29)

Rosonabant (INN; E-6776) is a drug acting as a CB1 receptor antagonist/inverse agonist that was under investigation by Esteve as an appetite suppressant for the treatment of obesity.[1][2] Development of the drug for clinical use was apparently halted shortly after the related CB1 antagonist rimonabant was discontinued in November 2008,[when?] due to the reports of severe psychiatric adverse effects such as anxiety, depression, and suicidal ideation associated with it and with similarly acting agents.[3][4][5]

See also


  1. ^ Janero DR, Makriyannis A (March 2009). "Cannabinoid receptor antagonists: pharmacological opportunities, clinical experience, and translational prognosis". Expert Opinion on Emerging Drugs. 14 (1): 43–65. doi:10.1517/14728210902736568. PMID 19249987. S2CID 74250986.
  2. ^ Vickers SP, Cheetham SC (2007). "Preclinical Developments in Antiobesity Drugs". In Kirkham TC, Cooper SJ (eds.). Appetite and Body Weight: Integrative Systems and the Development of Anti-Obesity Drugs. Academic Press. p. 325. ISBN 978-0-12-370633-1. Retrieved 12 May 2012.
  3. ^ Heal DJ, Gosden J, Smith SL (December 2009). "Regulatory challenges for new drugs to treat obesity and comorbid metabolic disorders". British Journal of Clinical Pharmacology. 68 (6): 861–874. doi:10.1111/j.1365-2125.2009.03549.x. PMC 2810797. PMID 20002080.
  4. ^ Lee HK, Choi EB, Pak CS (2009). "The current status and future perspectives of studies of cannabinoid receptor 1 antagonists as anti-obesity agents". Current Topics in Medicinal Chemistry. 9 (6): 482–503. doi:10.2174/156802609788897844. PMID 19689362. Archived from the original on 2013-05-22.
  5. ^ Moreira FA, Crippa JA (June 2009). "The psychiatric side-effects of rimonabant". Revista Brasileira de Psiquiatria. 31 (2): 145–153. doi:10.1590/S1516-44462009000200012. PMID 19578688.