Provided is a compound for specifically binding to amyloid ²-protein. The compound has thereon a nuclide with a large thermal neutron capture cross section and the compound is capable of specifically binding to the amyloid ²-protein. The property of the compound allows it to be used in conjunction with a neutron capture therapy device to eliminate amyloid ²-protein. Similarly, when the compound is labelled with radioactive element 11 C, the compound can also be used in conjunction with PET/CT for determining the part of the brain where amyloid ²-protein is deposited, for diagnosing Alzheimer's disease. Also disclosed is a preparation process for the compound. The beneficial effect of the present disclosure is to make the therapy and diagnosis of Alzheimer's disease more targeted by providing the compound for specifically binding to amyloid ²-protein.
