[{"from": "human", "value": "Given this chemical reaction, what are some reagents that could have been used? [C][O][C][=C][C][Branch1][C][Br][=C][N][Branch1][C][C][C][Ring1][Branch2][=O]>>[C][N][C][=C][Branch1][C][Br][C][=C][Branch1][C][O][C][Ring1][Branch2][=O]"}, {"from": "gpt", "value": "[Br][B][Branch1][C][Br][Br].[Cl][C][Cl]"}]