p-SCN-Bn-NOTA trihydrochloride is a macrocyclic chelator. p-SCN-Bn-NOTA trihydrochloride can be covalently coupled to molecules such as peptides through the thiocyanate group to form hexacoordinate copper (such as 64Cu) complexes. p-SCN-Bn-NOTA trihydrochloride specifically binds to GRPR or EGFR highly expressed on the surface of tumor cells, mediating tumor enrichment of radioactive probes. p-SCN-Bn-NOTA trihydrochloride can be used to study malignant tumors expressing GRPR or EGFR, such as prostate cancer and colorectal cancer[1][2].