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