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