1. Committee of National Pharmacopoeia, Pharmacopoeia of People's Republic of China, Chemical Industry Press, Beijing, 2000, p.86.
2. Qz123.COMhttp://www.qz123.com/News/Html/bdxx/gongzh/200711%5C200711691145.htm (accessed November 03, 2008).
3. http://www.efm.com.cn/html/news/2006_12_27_09_20_15_0581710594920186_06122709201586486_446.asp (accessed November 03, 2008).