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