AM-251 (drug)

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AM-251 (drug)
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.162.062 Edit this at Wikidata
Chemical and physical data
Molar mass555.24 g·mol−1
3D model (JSmol)

AM-251 is an inverse agonist at the CB1 cannabinoid receptor. AM-251 is structurally very close to rimonabant; both are biarylpyrazole cannabinoid receptor antagonists. In AM-251, the p-chloro group attached to the phenyl substituent at C-5 of the pyrazole ring is replaced with a p-iodo group. The resulting compound exhibits slightly better binding affinity for the CB1 receptor (with a Ki value of 7.5 nM) than rimonabant, which has a Ki value of 11.5 nM, AM-251 is, however, about two-fold more selective for the CB1 receptor when compared to rimonabant.[1] Like rimonabant, it is additionally a μ-opioid receptor antagonist.[2]

See also[edit]


  1. ^ Lan, R; Liu, Q; Fan, P; Lin, S; Fernando, SR; McCallion, D; Pertwee, R; Makriyannis, A (1999). "Structure-activity relationships of pyrazole derivatives as cannabinoid receptor antagonists". J Med Chem. 42 (4): 769–76. doi:10.1021/jm980363y. PMID 10052983.
  2. ^ Seely, KA; Brents, LK; Franks, LN; Rajasekaran, M; Zimmerman, SM; Fantegrossi, WE; Prather, PL (2012). "AM-251 and rimonabant act as direct antagonists at mu-opioid receptors: implications for opioid/cannabinoid interaction studies". Neuropharmacology. 63 (5): 905–15. doi:10.1016/j.neuropharm.2012.06.046. PMC 3408547. PMID 22771770.