[{"from": "human", "value": "What reagents could have been utilized in the following chemical reaction? [O][=C][C][C][S][=Branch1][C][=O][=Branch1][C][=O][C][C][Ring1][Branch2]>>[O][=S][=Branch1][C][=O][C][C][C][Branch1][C][O][C][C][Ring1][Branch2]"}, {"from": "gpt", "value": "[Cl].[O].[BH4-1].[Na+1]"}]