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