Cyclic peptides and use thereof

摘要

Disclosed are (1) a cyclic hexapeptide represented by formula [I] or a salt thereof: wherein X and Y each represent alpha -amino acid residues, A represents a D-acidic- alpha -amino acid residue, B represents a neutral- alpha -amino acid residue, C represents an L- alpha -amino acid residue and D represents a D- alpha -amino acid residue having an aromatic ring group; and (2) a pharmaceutical composition comprising the peptide represented by formula [I] or a pharmaceutically acceptable salt thereof as an active ingredient.