[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][O][C][=Branch1][C][=O][C][=C][N][=C][Branch1][Ring2][C][C][=O][C][=N][Ring1][=Branch2]>>[C][O][C][=Branch1][C][=O][C][=C][N][=C][Branch1][Ring2][C][C][O][C][=N][Ring1][=Branch2]"}, {"from": "gpt", "value": "[C][O].[Cl].[O].[BH4-1].[Cl-1].[Na+1].[Na+1]"}]