[{"from": "human", "value": "Please provide possible reagents based on the following chemical reaction. [C][O][C][=C][C][Branch1][C][I][=C][Branch1][Ring1][O][C][C][=C][Ring1][=Branch2][I]>>[C][O][C][=C][C][Branch1][C][I][=C][Branch1][C][O][C][=C][Ring1][Branch2][I]"}, {"from": "gpt", "value": "[Br][B][Branch1][C][Br][Br].[Cl][C][Cl]"}]