1. College of Life Sciences; Guangxi Normal Univ.; CN-541004 Guilin P. R. China
2. Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization, Guangxi Inst. of Botany, Guangxi Zhuang Autonomous Region and the Chinese Academy of Sciences; CN-541006 Guilin P. R. China
3. College of Chemistry and Life Science; Shenyang Normal Univ.; CN-110034 Shenyang P. R. China