[{"from": "human", "value": "Can you suggest some reagents that might have been used in the given chemical reaction? [O][=C][Branch1][C][O][C][C][C][C][C][C][C][C][C][C][Br]>>[O][C][C][C][C][C][C][C][C][C][C][C][Br]"}, {"from": "gpt", "value": "[C][C][C][O][C][Ring1][Branch1].[C][O][C][C][O][C][C][O][C].[BH4-1].[Na+1]"}]