Patent ID: 7375085

Claim:
A compound represented by the following Formula (1) or a salt thereof wherein R 5 represents a group represented by the following Formula (2), wherein m is 1 and: Ar represents an unsubstituted naphthyl group, R 1 , R 2 and R 3 each represent independently a hydrogen atom, an unsubstituted straight-chain alkyl group having 1 to 6 carbon atoms, an unsubstituted branched-chain alkyl group having 1 to 6 carbon atoms, R 4 represents an unsubstituted basic amino acid side chain, X 1 is an unsubstituted alkylene group having 1 to 6 carbon atoms, X 2 is a single bond, R 6 represents a hydrogen atom or —NHY, wherein Y represents a hydrogen atom, an acyl group having 2 to 22 carbon atoms, an alkyl group having 1 to 22 carbon atoms, a hydroxyalkyl group having 1 to 22 carbon atoms, or a 3-alkoxy-2-hydroxypropyl group wherein the alkoxyl group has 1 to 22 carbon atoms, n is 1, X 3 represents —NR 10 —, X 4 represents —O— or —NR 11 —, R 7 represents a side chain of an amino acid having a hydrophobic side chain selected from the group consisting of valine, norvaline, leucine, norleucine, isoleucine, phenylalanine, phenylglycine, threonine, and tryptophan, R 8 , R 10 , and R 11 each represent independently a hydrogen atom or a straight-chain or branched-chain alkyl group having 1 to 6 carbon atoms, R 9 represents a hydrogen atom, an acyl group having 2 to 22 carbon atoms, or an alkyl group having 1 to 22 carbon atoms.