Patent ID: 8133864

Claim:
A compound represented by the general formula (1), salt thereof or solvate thereof: Ar—CO—AA 1 —AA 2 —AA 3 —AA 4 —NH—X—Y (1) wherein Ar represents a phenyl group or an aromatic heterocyclic group optionally having substituent(s): AA 1 represents a hydrophobic amino acid; AA 2 represents an amino acid whose carbon chain between the carboxyl group and the amino group of the amino acid is absent of substituent(s) comprising more than two carbon atoms; AA 3 represents an amino acid whose carbon chain between the carboxyl group and the amino group of the amino acid is absent of substituent(s) comprising more than two carbon atoms; AA 4 represents a basic amino acid; X represents a straight chain or branched bivalent saturated aliphatic hydrocarbon group with 1-6 carbon atoms; and Y represents basic substituent(s); straight, branched, or cyclic saturated aliphatic hydrocarbon group having 1 to 6 carbon atoms; or aromatic hydrocarbon group having 6 to 10 carbon atoms.