1. State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, Jiangsu, China
2. School of Life Science and Technology, China Pharmaceutical University, Nanjing 211198, Jiangsu, China
3. Department of Chemistry, University of Florida, Gainesville, Florida 32611-7011, United States
4. State Key Laboratory of Pharmaceutical Biotechnology, Institute of Functional Biomolecules, School of Life Sciences, Nanjing University, Nanjing 210023, Jiangsu, China