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All sixteen stereoisomeric analogues of endomorphin-2 (H-Tyr-Pro-Phe-Phe-NH 2 ) were synthesized by Fmoc-strategy using solid phase methods. Although synthetic endomorphin-2 exhibited similar μ- and δ-opioid receptor-binding activity to the natural compound, endomorphin-2 analogues containing d-amino acid isomers exhibited lower interaction with μ-receptors depending on the particular combination...
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