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