1. School of Traditional Chinese Pharmacy; China Pharmaceutical University; Nanjing 211198 P. R. China
2. Department of Medicinal Chemistry; China Pharmaceutical University; Nanjing 211198 P. R. China
3. Department of Pharmaceutical Analysis; China Pharmaceutical University; Nanjing 210009 P. R. China
4. Key Laboratory of Biomedical Functional Materials; China Pharmaceutical University; Nanjing 211198 P. R. China
5. Jiangsu Food and Pharmaceutical Science College; Huaian 223003 P. R. China
6. Research Institute for Science and Technology; Tokyo University of Science; 2641 Yamazaki Noda Chiba 278-8510 Japan