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