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