[{"from": "human", "value": "Please propose potential reagents that might have been utilized in the provided chemical reaction. [O][=C][C][=C][C][=C][C][=C][Ring1][=Branch1][S][=Branch1][C][=O][=Branch1][C][=O][C][=C][C][=C][C][=C][Ring1][=Branch1]>>[O][=S][=Branch1][C][=O][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1][C][O]"}, {"from": "gpt", "value": "[C][O].[BH4-1].[Na+1]"}]