Patent ID: 7423007

Claim:
A peptide according to formula (I) Arg-Arg-Xaa 1 -Cys-Tyr-Xaa 2 -Lys-Xaa 3 -Pro-Tyr-Arg-Xaa 4 -Cys-Arg (I) (SEQ ID NO:64) or a salt thereof, wherein: (a) each amino acid may be a D- or L-amino acid (b) Xaa 1 is naphthylalanine; (c) Xaa 2 and Xaa 4 are citrulline; (d) Xaa 3 is Lys or D-Lys; and (e) the Arg at position 1 is derivatized at the N-terminus with a substituted benzoyl group selected from the group consisting of 2-fluorobenzoyl, 3-fluorobenzoyl, 4-fluorobenzoyl, 2-bromobenzoyl, 3-bromobenzoyl, 4-bromobenzoyl, 2-nitrobenzoyl, 3-nitrobenzoyl and 4-nitrobenzoyl.