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