[{"from": "human", "value": "Given the following chemical reaction, what are some potential reagents that could have been employed? [O][=C][C][C][C][=C][C][Branch1][Branch2][C][=C][C][=C][S][Ring1][Branch1][=C][C][=C][Ring1][O][Ring1][=C]>>[O][C][C][C][C][=C][C][Branch1][Branch2][C][=C][C][=C][S][Ring1][Branch1][=C][C][=C][Ring1][O][Ring1][=C]"}, {"from": "gpt", "value": "[C][C][O][C][Branch1][C][C][=O].[C][O].[BH4-1].[Na+1]"}]