[{"from": "human", "value": "Based on the given chemical reaction, can you propose some likely reagents that might have been utilized? [O][=C][C][C][C][C][=Branch1][C][=O][C][C][Ring1][=Branch1][C][Ring1][=Branch2]>>[O][=C][C][C][C][C][Branch1][C][O][C][C][Ring1][=Branch1][C][Ring1][=Branch2]"}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O].[C][C][Branch1][C][C][=O].[C][C][O].[Cl][C][Cl].[O].[BH4-1].[Na+1]"}]