PROCESS FOR PRODUCING OCTAPEPTIDE ATTACHED WITH SIALYLIC ACID

摘要

A sialic acid-bonded octapeptide represented by the following general formula (I): wherein R represents a hydrogen atom or an acetyl group; and R min represents a lower alkyl group, an aralkyl group, a hydrogen atom or an alkali metal atom, is herein desclosed. The peptide chain of the sialic acid-bonded octapeptide is constituted by 8 amino acid molecules on the C-terminus side of FTS and the compounds represented by formula (I) can be obtained by bonding sialic acid to the amino terminus of the peptide chain according to condensation. These octapeptides show excellent physiological activity comparable to FTS and a half life in blood longer than that of FTS and it is expected that the affinity of the peptide to lymphocytes is also enhanced. Thus they can effectively be used as medicines for treating the lowering and abnormality of functions of the thymus.