Patent ID: 8361443

Claim:
A compound of general formula (I) and pharmaceutically acceptable salt thereof wherein G represents glycine D represents aspartic acid R a represents —(CH 2 ) n — or —(CH 2 ) n —C 6 H 4 — wherein n represents a positive integer 1 to 10 h represents a positive integer 1 or 2 X 1 represents an amino acid residue wherein said amino acid possesses a functional side-chain, X 2 and X 6 represent independently amino acid residues together forming a disulphide bond, X 3 represents, N-methylarginine, X 4 represents a thiol-containing amino acid residue, and X 5 represents a hydrophobic amino acid, and X 7 is absent or a biomodifier moiety, wherein said biomodifier comprises 1-10 units of a monodisperse PEG building block, 1 to 10 amino acid residues or 1-10 units of formula (II) where m equals an integer from 1 to 10, Z 1 and Z 2 are each independently a Z group or is absent, Z is a PET or SPECT radionuclide imaging moiety, with the proviso that at least one Z 1 or Z 2 group is present, and W 1 represents a spacer moiety when Z1 is present.