(Dab9)-Neurotensin (8-13) is a peptide composed of 6 amino acids, in which the sequence contains an unnatural amino acid Dab. The structural formula of Dab is similar to Lys. In addition to the amino and carboxyl groups at the α position, the side chain also There is an amino functional map, so (Dab9)-Neurotensin (8-13) has similar biological functions to Neurotensin (8-13), but with different specificities.