KM 233

KM-233 is a synthetic cannabinoid drug which is a structural analog of Δ8-tetrahydrocannabinol (THC), the less active but more stable isomer of the active component of Cannabis. KM-233 differs from Δ8-THC by the pentyl side chain being replaced by a 1,1-dimethylbenzyl group. It has high binding affinity in vitro for both the CB₁ and CB₂ receptors, with a CB₂ affinity of 0.91 nM and 13-fold selectivity over the CB₁ receptor. In animal studies, it has been found to be a potential treatment for glioma, a form of brain tumor. A large number of related analogues are known where the 1,1-dimethylbenzyl group is substituted or replaced by other groups, with a fairly well established structure-activity relationship.