1. School of Chinese Materia Medica and Tianjin State Key Laboratory of Modern Chinese Medicine
2. Tianjin University of Traditional Chinese Medicine
3. Tianjin 300193
4. P. R. China
5. Department of Natural Products Chemistry
6. School of Pharmacy
7. Yantai University
8. Yantai 264005
9. School of Traditional Chinese Materia Medica
10. Key Laboratory of Structure-Based Drug Design & Discovery
11. Ministry of Education
12. Shenyang Pharmaceutical University