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