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JWH-051 retains high affinity for the CB1 receptor, 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. It has similar effects to other cannabinoid agonists such as sedation and analgesia, but with a relatively strong antiinflammatory effect due to its strong activity at CB2. |