[{"from": "human", "value": "Please suggest some possible reagents that could have been used in the following chemical reaction. [C][O][C][=C][N][=C][NH1][C][=C][C][Ring1][Branch1][=C][Ring1][=Branch2]>>[O][C][=C][N][=C][NH1][C][=C][C][Ring1][Branch1][=C][Ring1][=Branch2]"}, {"from": "gpt", "value": "[Br][B][Branch1][C][Br][Br].[C][C][C][O][C][Ring1][Branch1].[C][C][O][C][Branch1][C][C][=O].[O]"}]