[{"from": "human", "value": "Please suggest some possible reagents that could have been used in the following chemical reaction. [C][O][C][=Branch1][C][=O][C@@H1][C][C@H1][Ring1][Ring1][C][=Branch1][C][=O][O][C]>>[C][O][C][=Branch1][C][=O][C@@H1][C][C@H1][Ring1][Ring1][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "[Cl].[O][=P][Branch1][C][O-1][Branch1][C][O-1][O-1]"}]