Patent ID: 7329644

Claim:
A compound having the general formula (IX): A-[Y] z —C (IX) wherein A is a peptide selected from: H-Xaa1-Xaa2-Xaa3-Xaa4-Met-Dap-Trp-Met-Asp-Xaal0-Lys z is an integer between 0 and 5, Y is a spacer chain bonded to one of the functionalities present on the side chains of the individual amino acids present in peptide A, or to an N-terminal (—NH 2 ) group or a C-terminal (—CO 2 H) group of the peptide A, and to C; when z is an integer between 2 and 5, Y may be the same or different from each other, and C is a chelating agent bonded covalently to spacer chain Y or directly to peptide A, or to a number of amino acid units of peptide A, which is able to complex a paramagnetic metal or a radioisotope, their complexes with radioactive or paramagnetic metals or radioactive halogens, and salts thereof with physiologically acceptable organic or inorganic bases or with anions of physiologically acceptable organic or inorganic acids.