PROBLEM TO BE SOLVED: To provide a compound containing a bisphosphonate functional group with high affinity to bone tissues and a chelate agent with high affinity to a metal tracer, which is useful as a radioactive agent for bone scan.SOLUTION: A compound has a bisphosphonate functional group and a chelate agent part, represented by the following formula (2), where Q is an N-containing chelate agent-based bone seeker agent, each R2 are independently alkylene or alkylene amino, each R3 are independently hydroxy or H, each R4 is independently H, alkyl or aryl, and n is an integer of 1 to 4.SELECTED DRAWING: None【課題】骨スキャン用の放射性薬剤として有用な、骨組織に高親和性のビスホスホネート官能基及び金属トレーサーに高親和性のキレート剤部分を含む化合物の提供。【解決手段】下式(2)で示されるビスホスホネート官能基とキレート剤部分を有する化合物。［ＱはＮ含有キレート剤ベースの親骨性薬剤；各Ｒ２は独立にアルキレン又はアルキレンアミノ；各Ｒ３は独立にヒドロキシ又はＨ；各Ｒ４は独立にＨ、アルキル又はアリール；ｎは１～４の整数］【選択図】なし
