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