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