[{"from": "human", "value": "Based on the given chemical reaction, can you propose some likely reagents that might have been utilized? [Br][Br].[C][C][=Branch1][C][=O][C][C][=C][C][=C][Branch1][C][Cl][C][=C][Ring1][#Branch1]>>[O][=C][Branch1][Ring1][C][Br][C][C][=C][C][=C][Branch1][C][Cl][C][=C][Ring1][#Branch1]"}, {"from": "gpt", "value": "[Br].[C][C][=Branch1][C][=O][O].[C][C][Branch1][C][C][=O]"}]