[{"from": "human", "value": "Can you suggest some reagents that might have been used in the given chemical reaction? [C][O][C][=C][C][=C][Branch1][C][Br][C][Branch1][C][C][=C][Ring1][Branch2][C][=O]>>[C][C][=C][Branch1][C][Br][C][=C][C][Branch1][C][O][=C][Ring1][Branch2][C][=O]"}, {"from": "gpt", "value": "[Br][B][Branch1][C][Br][Br].[C][C][C][C][C][C].[C][C][O][C][Branch1][C][C][=O].[Cl][C][Cl].[O]"}]