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