1. Jiangsu New Medical College, Dictionary of Chinese Herb Medicine, Shanghai Scientific and Technologic Press, Shanghai, 586 (1986).
2. Q. H. Ye, G. W. Qin, and W. M. Zhao, Phytochemistry, 61, 885 (2002).
3. K. K. Chen and A. L. Chen, J. Bio. Chem., 111, 653 (1935).
4. W. M. Zhao, Q. H. Ye, X. J. Tan, H. L. Jiang, X. Y. Li, K. X. Chen, and A. D. Kinghorn, J. Nat. Prod., 64, 1196 (2001).
5. B. Talapatra, P. Mukhopadhyay, P. Chaudhury, and S. K. Talapatra, Indian J. Chem., 21B, 386 (1982).