1. School of Chinese Traditional Medicines China Pharmaceutical University Nanjing 210009 P. R. China
2. School of Pharmacy China Pharmaceutical University Nanjing 210009 P. R. China
3. Tibetan Medicine Institute Tibetan University of Tibetan Medicine Lhasa 850007 P. R. China
4. Jiangsu Food and Pharmaceutical Science College Huaian 223003 P. R. China
5. School of Pharmacy Nanjing Medical University Nanjing 211166 P. R. China