1. State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources
2. School of Chemistry and Pharmacy of Guangxi Normal University
3. Guilin 541004
4. PR China
5. Jiangsu Key Laboratory of Drug Discovery for Metabolic Diseases and
6. State Key Laboratory of Natural Medicines
7. Center of Drug Discovery
8. China Pharmaceutical University
9. Nanjing 210009