[{"from": "human", "value": "Can you provide potential reagents for the following chemical reaction? [Br][Br].[C][O][C][=C][C][Branch1][Ring1][C][=O][=C][C][=C][Ring1][Branch2][O]>>[C][O][C][=C][C][Branch1][Ring1][C][=O][=C][C][Branch1][C][Br][=C][Ring1][=Branch2][O]"}, {"from": "gpt", "value": "[C][O].[O]"}]