[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][O][C][C][=C][C][=C][Branch1][Ring1][C][=O][C][Branch1][C][N][=N][Ring1][=Branch2]>>[N][C][=N][C][Branch1][Ring1][C][O][=C][C][=C][Ring1][Branch2][C][=O]"}, {"from": "gpt", "value": "[Br][B][Branch1][C][Br][Br].[C][O].[Cl][C][Cl]"}]