1. Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy; Xuzhou Medical College; 209 Tongshan Road Xuzhou 221004 P. R. China
2. The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences; 202 Shachong South Road Guiyang 550002 P. R. China
3. Tianjin Institute of Pharmaceutical Research; 308 Anshan Xi Dao, Nankai District Tianjin 300193 P. R. China
4. 302 Hospital of PLA; 100 Xisihuan Zhong Road Fengtai Beijing 100039 P. R. China