[{"from": "human", "value": "Given the following chemical reaction, what are some potential reagents that could have been employed? [C][O][C][=Branch1][C][=O][C][=C][C][Branch1][C][Br][=C][C][Branch1][C][I][=C][Ring1][Branch2]>>[O][C][C][=C][C][Branch1][C][Br][=C][C][Branch1][C][I][=C][Ring1][Branch2]"}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][Al+1][C][C][Branch1][C][C][C].[Cl].[Cl][C][Cl].[H-1]"}]