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Peptidic δ opioid ligands used in the development of CSP.
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The pharmacophore points are the protonated nitrogen (N) on Tyr1, the centroid of the phenolic group (A) on Tyr1 (green) and the centroid of the hydrophobic group (B) (red). For 17 and 18 the various groups considered as the hydrophobic moiety are shown in red.
