[{"from": "human", "value": "Please suggest some possible reagents that could have been used in the following chemical reaction. [I][I].[O][C][C][=C][C][=C][C][=C][C][=C][C][Ring1][=Branch1][=C][Ring1][#Branch2][Br]>>[O][C][C][=C][Branch1][C][I][C][=C][C][=C][C][=C][C][Ring1][=Branch1][=C][Ring1][O][Br]"}, {"from": "gpt", "value": "[Cl][C][Branch1][C][Cl][Branch1][C][Cl][Cl]"}]