1. Hainan Provincial Key Laboratory of R&D of Tropical Herbs, School of Pharmacy, Hainan Medical College, Haikou 571199, China
2. State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
3. Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Spokane, WA 99212, USA