Synthesis of four new derivatives of enkephalin analogs: H-BuTyr-DMet-Gly- Phe-epsilon Ahx-OH 9, H-BzlTyr-DMet-Gly-Phe-epsilon Ahx-OH 12, H-Butyr-DMet-Gly- -Phe-epsilon Ahx-epsilon Ahx-OH 15 and H-BzlTyr-DMet-Gly-Phe-epsilon Ahx-OH is reported. They were examined for agonistic, antagonistic and analgesic activity. Compound 12 is the most potent among investigated peptides. Its agonistic activity in vitro is 7.85 x 10(-8) M/l (GPI) and 9.5 x 10(-7) M/l (MVD). None of the peptides showed antagonistic activity. Only compound 12 showed weak, not dose-dependent analgesic activity in rats.
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