[{"from": "human", "value": "Please suggest some possible reagents that could have been used in the following chemical reaction. [Br][Br].[C][O][C][=C][C][=C][C][Branch1][Ring2][C][C][O][=C][Ring1][=Branch2]>>[C][O][C][=C][C][=C][Branch1][C][Br][C][Branch1][Ring2][C][C][O][=C][Ring1][#Branch2]"}, {"from": "gpt", "value": "[Cl][C][Cl].[C][=C][C][=N][C][=C][Ring1][=Branch1]"}]