[{"from": "human", "value": "Please suggest some possible reagents that could have been used in the following chemical reaction. [O][=C][C][C][C][C][C][C][O][Ring1][=Branch1]>>[O][C][C][C][C][C][C][C][O][Ring1][=Branch1]"}, {"from": "gpt", "value": "[C][C][O].[BH4-1].[Na+1]"}]