1. Institute of Pharmaceutical Biology and Biotechnology
2. Heinrich Heine University Düsseldorf
3. 40225 Düsseldorf
4. Germany
5. Department of Organic Chemistry
6. University of Debrecen
7. H-4002 Debrecen
8. Hungary
9. Institute of Physiological Chemistry
10. Universitätsmedizin der Johannes Gutenberg-Universität Mainz
11. 55128 Mainz
12. State Key Laboratory of Natural and Biomimetic Drugs
13. Peking University
14. Beijing 100191
15. China