1. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China); School of Environment and Resource of Guangxi Normal University; Guilin 541004 P.R. China
2. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Ministry of Education of China); Guilin 541004 P.R. China
3. Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization; Guangxi Institute of Botany; Guilin 541006 P.R. China