One new prenylated flavonol, 7,8-(2'',2'' -dimethylpyrano)-5,3',4'-trihydroxy-3-methoxyflavone was isolated from Hypericum japonicum. The chemical structure was determined by spectroscopic meth...One new prenylated flavonol, 7,8-(2'',2'' -dimethylpyrano)-5,3',4'-trihydroxy-3-methoxyflavone was isolated from Hypericum japonicum. The chemical structure was determined by spectroscopic methods.展开更多
Two new alkaloids named piperlactam S, piperine S were isolated from Piper puberulum (Benth.)Maxim.The structues were elucidated by the spetral data including 1H-1H COSY, 14H-(13)C COSY, long-range 1H-(13)C COSY and...Two new alkaloids named piperlactam S, piperine S were isolated from Piper puberulum (Benth.)Maxim.The structues were elucidated by the spetral data including 1H-1H COSY, 14H-(13)C COSY, long-range 1H-(13)C COSY and NOE.展开更多
文摘One new prenylated flavonol, 7,8-(2'',2'' -dimethylpyrano)-5,3',4'-trihydroxy-3-methoxyflavone was isolated from Hypericum japonicum. The chemical structure was determined by spectroscopic methods.
文摘Two new alkaloids named piperlactam S, piperine S were isolated from Piper puberulum (Benth.)Maxim.The structues were elucidated by the spetral data including 1H-1H COSY, 14H-(13)C COSY, long-range 1H-(13)C COSY and NOE.
