1. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
2. School of Chemistry and Pharmacy
3. Guangxi Normal University
4. Guilin 541004
5. P. R. China
6. Department of Chemistry
7. Nankai Unversity
8. Tianjin 300071
9. China
10. Institut de Chimie de Strasbourg
11. CNRS-UMR 7177
12. Université de Strasbourg
13. 67008 Strasbourg Cedex
14. France