[{"from": "human", "value": "Please suggest some possible reagents that could have been used in the following chemical reaction. [C][O][C][=C][C][=C][C][=C][Branch1][Ring1][C][=O][C][=C][C][Ring1][Branch2][=C][Ring1][N][Br]>>[C][O][C][=C][C][=C][C][=C][Branch1][Ring1][C][O][C][=C][C][Ring1][Branch2][=C][Ring1][N][Br]"}, {"from": "gpt", "value": "[C][C][C][O][C][Ring1][Branch1].[C][O].[O].[BH4-1].[Na+1]"}]