[{"from": "human", "value": "Given the following chemical reaction, what are some potential reagents that could have been employed? [O][=C][Branch1][C][O][C][=C][N][=C][C][Branch1][C][Br][=C][Ring1][#Branch1]>>[O][C][C][=C][N][=C][C][Branch1][C][Br][=C][Ring1][#Branch1]"}, {"from": "gpt", "value": "[C][C][C][O][C][Ring1][Branch1].[C][C][N][Branch1][Ring1][C][C][C][C].[C][C][O][C][=Branch1][C][=O][Cl].[O].[BH4-1].[Na+1]"}]