HU-243 (AM-4056) is a synthetic cannabinoid drug that is a single enantiomer of the hydrogenated derivative of the commonly used reference agonist HU-210. It is a potent agonist at both the CB1 and CB2 receptors with a binding affinity of 0.041nM at the CB1 receptor making it marginally more potent than HU-210 which had an affinity of 0.061nM in the same assay.
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