1. State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing 211100, P. R. China
2. Department of Pharmacology, School of Pharmacy, China Pharmaceutical University, Nanjing 211100, P. R. China
3. School of Pharmacy, Wannan Medical College, Wuhu 241002, P. R. China
4. School of Pharmacy, Mongolian National University of Medical Science, Ulaanbaatar 14210, Mongolia
5. Department of Pharmaceutics, China Pharmaceutical University, Nanjing 210009, P. R. China