[{"from": "human", "value": "Based on the given chemical reaction, can you propose some likely reagents that might have been utilized? [C][=C][Branch1][C][Br][C][Br].[C][C][C][C][C][C][O]>>[C][=C][Branch1][C][Br][C][O][C][C][C][C][C][C]"}, {"from": "gpt", "value": "[C][C][C][C][C][C].[C][C][C][C][N+1][Branch1][Branch1][C][C][C][C][Branch1][Branch1][C][C][C][C][C][C][C][C].[O].[Br-1].[Na+1].[OH1-1]"}]