[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][C][C][Branch1][Ring1][C][C][Branch1][Branch2][C][O][C][Branch1][C][C][=O][C][S][Branch1][C][N][=Branch1][C][=O][=O]>>[C][C][C][Branch1][Ring1][C][C][Branch1][Ring1][C][O][C][S][Branch1][C][N][=Branch1][C][=O][=O]"}, {"from": "gpt", "value": "[C][O].[C][O].[C][O-1].[Na+1]"}]