JWH-149 is a synthetic cannabimimetic that was discovered by John W. Huffman. It is the N-pentyl analog of JWH-148. It is a potent but only moderately selective ligand for the CB2 receptor, with a binding affinity of Ki = 0.73 ± 0.03 nM at this subtype, and more than 6 times selectivity over the CB1 subtype.
^Huffman, J.; et al. (2005). "Structure-activity relationships for 1-alkyl-3-(1-naphthoyl)indoles at the cannabinoid CB(1) and CB(2) receptors: steric and electronic effects of naphthoyl substituents. New highly selective CB(2) receptor agonists.". Bioorganic & Medicinal Chemistry. 13 (1): 89–112. PMID15582455. doi:10.1016/j.bmc.2004.09.050.