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