Patent ID: 7220827

Claim:
A compound that binds to leukocytes, wherein said compound is represented by the formula (1): Z-Y-Leu-Phe-(X) n -Lys(NH 2 ) m -ε(-R-(T) 1 -U) (1) wherein, in the formula (1), Z represents a protecting group for an amino group; Y represents Met or Nle; X represents a spacer consisting of one or more of amino acids and/or synthetic organic compounds; n represents 1 or 0; NH 2 represents an amide group as a protecting group for a carboxyl group in the α position of Lys; m represents 1 or 0; R represents Ser or Thr binding to an ε-amino group of Lys through an amide bond; T represents a spacer consisting of one or more of amino acids and/or synthetic organic compounds; l represents 1 or 0; and U represents a group which can be labeled with a metal; with the proviso that said X and T may be the same or different from each other.