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