[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [N][#C][C][C][C][C][C][=Branch1][C][=O][O-1]>>[N][#C][C][C][C][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "[Cl].[NH4+1]"}]