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