CAS Number 176977-56-3
PubChem (CID) 5311257
ChemSpider 4470772
ECHA InfoCard 100.190.302
Chemical and physical data
Formula C24H17NO4
Molar mass 383.395
3D model (Jmol) Interactive image

LY-320,135 is a drug used in scientific research which acts as a selective antagonist of the cannabinoid receptor CB1. It was developed by Eli Lilly and Company in the 1990s.

LY-320,135 displays fairly good selectivity, with a binding affinity for CB1 around 70x stronger than for CB2,[1] but both its potency and selectivity are modest compared to newer agents, and at higher doses it also binds to a range of non-cannabinoid receptors. However LY-320,135 is still fairly widely used in research, particularly for elucidating the mechanisms by which many CB1 antagonists act as inverse agonists at higher doses.[2]


  1. Felder CC, Joyce KE, Briley EM, Glass M, Mackie KP, Fahey KJ, Cullinan GJ, Hunden DC, Johnson DW, Chaney MO, Koppel GA, Brownstein M. LY320135, a novel cannabinoid CB1 receptor antagonist, unmasks coupling of the CB1 receptor to stimulation of cAMP accumulation. Journal of Pharmacology and Experimental Therapeutics. 1998 Jan;284(1):291-7. PMID 9435190
  2. Pertwee RG. Inverse agonism and neutral antagonism at cannabinoid CB1 receptors. Life Sciences. 2005 Feb 4;76(12):1307-24. PMID 15670612

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