A new opioid designed multiple ligand derived from the μ opioid agonist endomorphin-2 and the δ opioid antagonist pharmacophore Dmt-Tic

Opioid compounds with mixed μ agonist/δ antagonist properties could be used as analgesics with low propensity to induce tolerance and dependence. Here we report the synthesis of a new designed multiple ligand deriving from the μ selective agonist endomorphin-2 and the δ selective antagonist pharmacophore Dmt-Tic. As predicted, the resulting bivalent ligand showed a μ agonist/δ antagonist profile deriving from the corresponding activities of each pharmacophore.

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