Some nonpeptide psychotropic drugs are known to repre- sent the ligands of the corresponding neuropeptide receptors. For example, morphine acts via the enkephalin receptors [1], while the benzodiazepine tranquilizers are the ligands of the DBI peptide receptors [2]. This circumstance gives us a pos- sibility to synthesize biologically active short-chain peptides that are structural analogs of the known neurotropic agents and may serve as base structures for the ...