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DALDA analogues containing α-hydroxymethylamino acids.

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Olma A., Chung N. N., Schiller P. W., Zabrocki J.
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2001
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vol. 48
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issue 4
1121-1124
EN
To evaluate the role of aromatic amino-acids residues, four analogues of the μ-selec-tive opioid peptide agonist DALDA (H-Tyr-D-Arg-Phe-Lys-NH2) containing the amphiphilic, α,α-disubstituted amino acid (R)- or (S)-α-hydroxymethyltyrosine (HmTyr) in position 1 and (R)- or (S)-α-hydroxymethylphenylalanine (HmPhe) in position 3 of the peptide sequence were synthesized. Only the [(R)-HmPhe3)]DALDA analogue displayed full agonistic activity in both the guinea pig ileum and the mouse vas deferens assays and turned out to be a δ receptor-selective opioid agonist.
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