[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][O][C][=C][C][Branch1][Ring1][C][=O][=C][C][Branch1][C][Br][=C][Ring1][=Branch2][O]>>[O][=C][C][=C][C][Branch1][C][O][=C][Branch1][C][O][C][Branch1][C][Br][=C][Ring1][=Branch2]"}, {"from": "gpt", "value": "[Cl].[Cl][C][Cl].[Al+3].[Cl-1].[Cl-1].[Cl-1].[C][=C][C][=N][C][=C][Ring1][=Branch1]"}]