[{"from": "human", "value": "Given the following chemical reaction, what are some potential reagents that could have been employed? [Br][Br].[C][O][C][=C][C][=C][C][Branch1][Ring1][O][C][=C][Ring1][Branch2][O]>>[C][O][C][=C][C][=C][Branch1][C][Br][C][Branch1][Ring1][O][C][=C][Ring1][=Branch2][O]"}, {"from": "gpt", "value": "[Cl][C][Branch1][C][Cl][Branch1][C][Cl][Cl]"}]