[{"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][Ring2][=C][Ring1][=Branch1][C][C][=Branch1][C][=O][N][Ring1][#Branch1]>>[O][=C][C][C][=C][C][Branch1][C][O][=C][C][=C][Ring1][#Branch1][N][Ring1][#Branch2]"}, {"from": "gpt", "value": "[Br][B][Branch1][C][Br][Br].[C][S][C].[Cl][C][C][Cl]"}]