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