1. College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
2. Molecular Targets Program, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702-1201, United States
3. Marine Science & Technology Institute, College of Environmental Science & Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, People’s Republic of China
4. Basic Science Program, Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702-1201, United States
5. Natural Products Branch, Development Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute, Frederick, Maryland 21702-1201, United States