1. State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, The Chinese Academy of Sciences, Kunming, P. R. China
2. Department of Chemistry and Engineering, Guilin Normal College, Guilin, P. R. China
3. Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, P. R. China