FIELD: chemistry of proteins. SUBSTANCE: invention describes novel compounds of the general formula (I): X1-His-Gly-X2-His-Gly-Val-X3 or their pharmaceutically acceptable salts, or esters, or amides where X1 is absent or has at least one amino acids; X2 has at least one amino acid or means a peptide bond; X3 is absent or has at least one amino acid being indicated amino acids are taken among aliphatic, aromatic or heterocyclic group. Compounds stimulate antiviral, antibacterial and antitumor activity of human immune system. EFFECT: new peptides indicated above, valuable medicinal properties. 7 cl, 17 tbl, 2 dwg _
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