[{"from": "human", "value": "Please propose potential reagents that might have been utilized in the provided chemical reaction. [Br][Br].[C][C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][O][Ring1][=Branch1]>>[C][C][=C][C][=C][Branch1][=Branch1][C][=C][Ring1][=Branch1][Br][O][C][O][Ring1][Branch2]"}, {"from": "gpt", "value": "[Cl][C][Cl].[C][=C][C][=N][C][=C][Ring1][=Branch1]"}]