[{"from": "human", "value": "Can you suggest some reagents that might have been used in the given chemical reaction? [Br][Br].[C][O][C][=C][C][=C][C][=C][Branch1][Ring1][C][=O][C][=C][C][Ring1][Branch2][=C][Ring1][N]>>[C][O][C][=C][C][=C][C][=C][Branch1][Ring1][C][=O][C][=C][C][Ring1][Branch2][=C][Ring1][N][Br]"}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O]"}]