[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [O][=N+1][Branch1][C][O-1][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=N][Ring1][=Branch1]>>[N][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=N][Ring1][=Branch1]"}, {"from": "gpt", "value": "[C][C][O].[O][=S][=Branch1][C][=O][Branch1][C][O-1][O-1].[BH4-1].[Cu+2].[Na+1]"}]