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