1. School of Pharmaceutical Science and Yunnan Key Laboratory of Pharmacology of Natural ProductsKunming Medical University Kunming 650500 P. R. China
2. Affiliated Hospital of Panzhihua University Panzhihua 617000 P. R. China
3. School of Chinese MedicineHong Kong Baptist University Hong Kong SAR 999077 P. R. China
4. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of BotanyChinese Academy of Sciences Kunming 650201 P. R. China