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Carbonic anhydrase-IX (CA-IX) is a zinc enzyme overexpressed in the hypoxic regions of many types of solid tumors; therefore, in vivo imaging of CA-IX may contribute to cancer diagnosis. In this study, we newly designed and synthesized an 111In-labeled CA-IX imaging agent based on an imidazothiadiazole sulfonamide (IS) scaffold conjugated with a chelating moiety, DO3A ([111In]DO3A-IS1), and evaluated its utility for imaging of CA-IX high-expressing tumors. [111In]DO3A-IS1 was successfully synthesized at a 76% radiochemical yield by reacti