Used in radiopharmaceuticals for targeted imaging and therapy, particularly in positron emission tomography (PET). Its structure allows stable chelation of metal ions like gallium-68 or lutetium-177, enabling precise tumor targeting when linked to bioactive molecules such as peptides. Commonly applied in oncology for diagnosing and treating neuroendocrine tumors and prostate cancer. Also serves as a building block in bioconjugation strategies for molecular imaging probes.