PROBLEM TO BE SOLVED: To provide a cyclodextrin dimer which can be easily synthesized and is high in yield amount and yield rate to provide an inclusion complex in which the cyclodextrin dimer includes a water-soluble porphyrin and which has high affinity with oxygen, carbon monoxide and cyanide ions and to provide an oxygen infusion for artificial blood, a carbon monoxide removing agent and a cyanide antidote each including the inclusion complex as an active component.SOLUTION: A cyclodextrin dimer is expressed by formula (1). An inclusion complex is obtained by including a water-soluble metal porphyrin in the cyclodextrin dimer. Further, an oxygen infusion for artificial blood, a carbon monoxide removing agent and a cyan antidote including the inclusion complex as an active component are also provided.COPYRIGHT: (C)2014,JPO&INPIT【課題】容易に合成することができ、収量や収率の高いシクロデキストリン二量体、このシクロデキストリン二量体が水溶性ポルフィリンを包接してなり、酸素、一酸化炭素、シアン化物イオンとの親和性が高い包接錯体、及びこの包接錯体を有効成分として含有する人工血液用酸素輸液、一酸化炭素除去剤、シアン解毒剤の提供。【解決手段】式(1)で示されるシクロデキストリン二量体。該シクロデキストリン二量体が水溶性金属ポルフィリンを包接してなる包接錯体。さらに、該包接錯体を有効成分として含有する人工血液用酸素輸液、一酸化炭素除去剤、シアン解毒剤。【選択図】なし