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