[{"from": "human", "value": "Given the following chemical reaction, what are some potential reagents that could have been employed? [Br][Br].[C][C][=Branch1][C][=O][C][=C][Branch1][C][C][C][=C][Branch1][Ring1][C][#N][C][=C][Ring1][=Branch2][C]>>[C][C][=C][C][Branch1][Ring1][C][#N][=C][C][Branch1][C][C][=C][Ring1][=Branch2][C][=Branch1][C][=O][C][Br]"}, {"from": "gpt", "value": "[C][C][O][C][C][O][Ring1][=Branch1].[C][C][O][C][C].[Cl-1].[NH4+1]"}]