[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][C][=Branch1][C][=O][O].[N][=C][Branch1][C][N][N][C][C][C][C][C@H1][Branch1][C][O][C][C][=Branch1][C][=O][O]>>[C][C][=Branch1][C][=O][O][C@@H1][Branch1][O][C][C][C][C][N][C][=Branch1][C][=N][N][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "[Cl]"}]