[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][O][C][C][O][C][Cl].[O][C][C][=C][C][Branch1][C][Br][=C][C][=C][Ring1][#Branch1][Cl]>>[C][O][C][C][O][C][O][C][C][=C][C][Branch1][C][Br][=C][C][=C][Ring1][#Branch1][Cl]"}, {"from": "gpt", "value": "[C][C][N][Branch1][=Branch1][C][Branch1][C][C][C][C][Branch1][C][C][C].[Cl][C][Cl].[Cl-1].[NH4+1]"}]