V1b radioactive labeled receptors

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PROBLEM TO BE SOLVED : To provide a novel radioactive isotope-labeled ligand which specifically binds a vasopressin V1b receptor, and further a radioactive isotope-labeled ligand for image diagnosis which is stable even if administering inside a living body and reaches a target organ.SOLUTION : The novel radioactive isotope-labeled ligand of the present invention is a compound represented by general formula (I) or a pharmaceutically accepted salt of the same (in the above general formula (I), X, R, and Rare just as defined in the specifications).