1. B. L. Guo, P. G. Xiao, and S. L. Yang, World. Notes. Plant. Med., 10, 159 (1995).
2. W. Y. Kang, J. M. Wang, and P. Y. Tian, Chem. Nat. Compd., 47, 452 (2011).
3. J. F. Wei, Z. H. Yin, and F. D. Shang, Afr. J. Pharm. Pharmacol., 6, 2484 (2012).
4. J. F. Wei, Q. Zhang, F. D. Shang, and W. Y. Kang, Chem. Nat. Compd., 47, 454 (2011).
5. F. F. Gao, D. Zhao, and J. Deng, Chin. JMAP, 28, 907 (2011).