1. State Key Laboratory of Natural Medicines
2. China Pharmaceutical University
3. Nanjing 210009, PR China
4. Department of Medicinal Chemistry
5. Department of Microbiology
6. Immunology and Molecular Genetics
7. University of Kentucky College of Medicine
8. Lexington, USA
9. Department of Organic Chemistry
10. Jiangsu Provincial Institute of Traditional Chinese Medicine
11. Nanjing 210028, PR China