1. National Pharmacopoeia Committee. Chinese Pharmacopoeia, Vol. I, 2010, p. 12.
2. W. Qu and J. Y. Liang, Strait. Pharm. J., 19, 1 (2007).
3. W. Qu and J. Y. Liang, Chin. Chem. Lett., 20, 1342 (2009).
4. T. Biftu, B. G. Hazra, and R. Stevenson, J. Chem. Soc. Perkin Trans., 2276 (1997).
5. S. Y. Ryu, K. S. Oh, Y. S. Kim, and B. H. Lee, J. Ethnopharmacol., 118, 284 (2008).