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