GR-89696
GR-89696 is a drug which acts as a highly selective κ-opioid agonist.[1] It has been studied in various animal species, and has been described as selective for the κ2 subtype.[2][3][4] Recent studies have suggested that GR-89696 and related κ2-selective agonists may be useful for preventing the itching which is a common side effect of conventional opioid analgesic drugs, without the additional side effects of non-selective kappa agonists.[5] The structure bound to the κ-opioid receptor has been reported.[6] References
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