1. State Key Laboratory of Natural Medicines; China Pharmaceutical University; 24 Tong Jia Xiang Nanjing 210009 China
2. Department of Medicinal Chemistry; China Pharmaceutical University; 24 Tong Jia Xiang Nanjing 210009 China
3. Department of Organic Chemistry; China Pharmaceutical University; 24 Tong Jia Xiang Nanjing 210009 China
4. Department of Microbiology, Immunology and Molecular Genetics; University of Kentucky College of Medicine; 800 Rose Street Lexington KY 40536 USA
5. College of Pharmacy and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research; Jinan University; Guangzhou 510632 China