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