[{"from": "human", "value": "Please propose potential reagents that might have been utilized in the provided chemical reaction. [Br][Br].[C][O][C][=Branch1][C][=O][C][C][=C][C][=C][Branch1][C][O][C][=C][Ring1][#Branch1]>>[C][O][C][=Branch1][C][=O][C][C][=C][C][=C][Branch1][C][O][C][Branch1][C][Br][=C][Ring1][Branch2]"}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O].[Cl][C][Branch1][C][Cl][Cl].[Cl][C][Cl]"}]