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