PROBLEM TO BE SOLVED : To provide CA-IX targeted, low-molecular weight pharmaceuticals that exhibit high specificity and fast clearance and are available in diagnosing and treating cancer and also applicable to theranostics of cancer. SOLUTION : The invention provides a compound represented by the general formula (2) in the figure, where M3+ is a trivalent metal element.) SELECTED DRAWING : None COPYRIGHT : (C)2019, JPO&INPIT