[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][C][C][C][S][C][C][O].[O][=C][C][C][C][C][C][N][Ring1][#Branch1][C][C][C][C][C][Br]>>[C][C][C][C][S][C][C][O][C][C][C][C][C][N][C][C][C][C][C][C][Ring1][#Branch1][=O]"}, {"from": "gpt", "value": "[C][S][Branch1][C][C][=O].[K+1].[OH1-1]"}]