References
- Khac , DD , Sung , TV and Campos , AM . 1989 . Phytochemistry , 29 : 251 – 256 .
- Tanaka , T , Jiang , ZH and Kouno , I . 1998 . Phytochemistry , 47 : 851 – 854 .
- Ye , L and Yang , JS . 1996 . Chin. Chem. Lett. , 7 : 335 – 336 .
- Sato , T . 1987 . Phytochemistry , 26 : 2124 – 2125 .
- Terashima , S and Shimizu , M . 1990 . Chem. Pharm. Bull. , 38 : 2733 – 2736 .