[{"from": "human", "value": "Please provide possible reagents based on the following chemical reaction. [Br][Br].[C][C][=C][C][Branch1][C][Cl][=C][C][=C][Ring1][#Branch1][Br]>>[C][C][=C][C][Branch1][C][Cl][=C][Branch1][C][Br][C][=C][Ring1][Branch2][Br]"}, {"from": "gpt", "value": "[Br].[C][C][Branch1][C][Cl][Cl].[Fe]"}]