[{"from": "human", "value": "Given this chemical reaction, what are some reagents that could have been used? [O][=C][Branch1][C][O][C][C][C][=C][C][=C][Branch1][C][Br][C][=C][Ring1][#Branch1]>>[O][=C][C][C][C][=C][C][=C][Branch1][C][Br][C][=C][Ring1][#Branch1][Ring1][#Branch2]"}, {"from": "gpt", "value": "[Cl][C][Cl].[O][=S][Branch1][C][Cl][Cl].[Al+3].[Cl-1].[Cl-1].[Cl-1]"}]