1. School of Pharmacy, Lanzhou University; Lanzhou 730000; P. R. China
2. Provincial Engineering Laboratory of Biopesticide Preparation; Zhejiang A&F University; Lin'an 311300 P. R. China
3. Natural Products Research Laboratories, Eshelman School of Pharmacy; University of North Carolina; Chapel Hill NC 27599
4. Environmental and Municipal Engineering School; Lanzhou Jiaotong University; Lanzhou 730000 P. R. China
5. Chinese Medicine Research and Development Center; China Medical University Hospital; Taichung 40447 Taiwan