1. Shaanxi Key Laboratory of Natural Products & Chemical Biology
2. College of Chemistry & Pharmacy
3. Northwest A&F University
4. Yangling 712100
5. China
6. Laboratory of Computer-Aided Drug Design & Discovery
7. Beijing Institute of Pharmacology and Toxicology
8. Beijing 100850
9. P.R. China
10. College of Chemistry
11. Chemical Engineering and Environmental Engineering
12. Liaoning Shihua University
13. Fushun 113001