[{"from": "human", "value": "Please suggest some possible reagents that could have been used in the following chemical reaction. [Br][Br].[O][C][=C][C][=C][C][=C][C][=N][C][Ring1][=Branch1][=C][Ring1][#Branch2]>>[O][C][=C][C][=C][C][=C][C][=N][C][Ring1][=Branch1][=C][Ring1][#Branch2][Br]"}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O].[C][C][O][C][Branch1][C][C][=O].[Cl][C][Cl]"}]