O-823 is a drug which is a

cannabinoid Cannabinoids () are several structural classes of compounds found in the cannabis plant primarily and most animal organisms (although insects lack such receptors) or as synthetic compounds. The most notable cannabinoid is the phytocannabinoid tet ...

derivative that is used in scientific research. It is described as a mixed agonist/antagonist at the cannabinoid

receptor Receptor may refer to: * Sensory receptor, in physiology, any structure which, on receiving environmental stimuli, produces an informative nerve impulse *Receptor (biochemistry), in biochemistry, a protein molecule that receives and responds to a ...

CB₁, meaning that it acts as an antagonist when co-administered alongside a more potent CB₁ agonist, but exhibits weak partial agonist effects when administered by itself.

References

Cannabinoids Benzochromenes Phenols Alkyne derivatives Nitriles {{cannabinoid-stub