| abstract |
The present invention provides a cyclic peptide which has a unit structure selected from among the structures represented by formula (1) -X1-X2-X3-X4-X5-, or a pharmaceutically acceptable salt of the cyclic peptide. (In formula (1), X1 represents I, V or L, or an N-alkyl amino acid of I, V or L; X2 represents S or T, or an N-alkyl amino acid of S or T; X3 represents K or an N-alkyl amino acid thereof; X4 represents W or an N-alkyl amino acid thereof; and X5 represents W, Y, H or K, or an N-alkyl amino acid of W, Y, H or K.) |