JWH-051 is an analgesic drug which is a cannabinoidagonist. Its chemical structure is closely related to that of the potent cannabinoid agonist HU-210, with the only difference being the removal of the hydroxyl group at position 1 of the aromatic ring. It was discovered and named after John W. Huffman.
JWH-051 retains high affinity for the CB1receptor, but is a much stronger agonist for CB2, with a Ki value of 14nM at CB2 vs 19nM at CB1. It was one of the first CB2-selective ligands developed, although its selectivity for CB2 is modest compared to newer compounds such as HU-308.
^Huffman JW, Yu S, Showalter V, Abood ME, Wiley JL, Compton DR, et al. (September 1996). "Synthesis and pharmacology of a very potent cannabinoid lacking a phenolic hydroxyl with high affinity for the CB2 receptor". Journal of Medicinal Chemistry. 39 (20): 3875–7. doi:10.1021/jm960394y. PMID8831752.
^Griffin G, Fernando SR, Ross RA, McKay NG, Ashford ML, Shire D, et al. (November 1997). "Evidence for the presence of CB2-like cannabinoid receptors on peripheral nerve terminals". European Journal of Pharmacology. 339 (1): 53–61. doi:10.1016/S0014-2999(97)01336-8. PMID9450616.