[1] Jianshu New Medical College, The Dictionary of Chinese Traditional Medicines. Shanghai People Press. Shanghai, 1977: 1530. [2] Institute of Chinese Desert, Medicinal Plants of Chinese Desert Area. Beijing: Sciences Press, 1992: 51-52. [3] Jia SS. Acta Planta, 1990, 13: 738. [4] Jia SS. Chin Trad Med, 1991, 22: 441. [5] Martha Windhoiz. The Merck Index (ninth edition), 1976: 479. [6] Shriner Adams. J Am Chem Soc, 1975, 47: 2727. [7] N. Baner. Phytochemistry, 1975, 14: 1447. [8] M. Takido. The Structures of Natural Products, 1978: 18. [9] Martha Windhoiz. The Merck Index (ninth edition), 1976: 907. [10] Jones RN, Roberts G. J Am Chem Soc, 1958, 80 : 6121.