AM-906 (part of the AM cannabinoid series) is an analgesic drug which is a cannabinoidagonist. It is conformationally restricted by virtue of the double bond on its side chain, leading an increased affinity for and selectivity between CB1 and CB2 receptors. It is a potent and selective agonist for the CB1 cannabinoid receptor, with a Ki of 0.8 nM at CB1 and 9.5 nM at CB2, a selectivity of almost 12x.
^Busch-Petersen, Jakob; Hill, W. Adam; Fan, Pusheng; Khanolkar, Atmaram; Xie, Xuang-Qun; Tius, Marcus A.; Makriyannis, Alexandros (1996). "Unsaturated Side Chain β-11-Hydroxyhexahydrocannabinol Analogs". Journal of Medicinal Chemistry. 39 (19): 3790–3796. ISSN0022-2623. doi:10.1021/jm950934b.
^Papahatjis DP, et al. Pharmacophoric requirements for cannabinoid side chains: multiple bond and C1'-substituted delta 8-tetrahydrocannabinols. Journal of Medicinal Chemistry. 1998 Mar 26;41(7):1195-200. PMID9544219