An imaging agent comprising a conjugate of Formula I: wherein: Z1 is attached to the N-terminal end of cMBP, and is H or MIG； Z2 is fixed to the C-terminal end of cMBP and is OH, OBC or MIG, in which Bc is a biocompatible cation； cMBP is a cyclic cMet binding peptide of 17 to 30 amino acids comprising the amino acid sequence (SEC-1): Cysa-X1-Cysc-X2-Gly-Pro-Pro-X3-Phe-Glu-Cysd-Trp- Cysb-Tyr-X4-X5-X6； in which X1 is Asn, His or Tyr； X2 is Gly, Ser, Thr or Asn； X3 is Thr or Arg； X4 is Ala, Asp, Glu, Gly or Ser； X5 is Ser or Thr； X6 is Asp or Glu； and Cysa-d are each cysteine residues so that those residues a and b as well as c and d are cycled to form two different disulfide bonds； MIG is a metabolism inhibitor group that is a biocompatible group that inhibits or suppresses the peptide's in vivo metabolism； L is a synthetic linker group of the formula - (A) m- in which each A is independently -CR2-, -CR>； = CR-, -C≡C-, -CR2CO2-, -CO2CR2-, -NRCO- , -CONR-, -NR (C>； = O) NR-, -NR (C>； = S) NR-, -SO2NR-, -NRSO2-, -CR2OCR2-, -CR2SCR2-, -CR2NRCR2-, a cycloheteroalkylene group C4-8, a C4-8 cycloalkylene group, a C5-12 arylene group, or a C3-12 heteroarylene group, an amino acid, a sugar or a single component polyethylene glycol (PEG) basic component； each R is independently selected from H, C 1-4 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, C 1-4 alkoxyalkyl or C 1-4 hydroxyalkyl, m is an integer from 1 to 20； n is an integer of a value of 0 or 1； IM is an optical imaging indicator moiety suitable for imaging the body of mammals in vivo using light of a near-infrared green wavelength of 600-1,200 nm.Un agente de formación de imágenes que comprende un conjugado de Fórmula I: en la que: Z1 está fijado al extremo N-terminal de cMBP, y es H o MIG；Z2 está fijado al extremo C-terminal de cMBP y es OH, OBC o MIG, en la que Bc es un catión biocompatible； cMBP es un péptido cíclico de unión a cMet de 17 a 30 aminoácidos que comprende la secuencia de aminoácidos (SEC-1): Cysa-X1-Cysc-X
