1. College of Pharmacy, Shaanxi University of Chinese Medicine, Xi’an-Xianyang New Ecomic Zone, Xianyang, Shaanxi, P. R. China;
2. School of Chemistry and Materials Science, Huaihua University, Hunan, Huaihua, P. R. China;
3. Key Laboratory of Research and Utilization of Ethnomedicinal Plant Resources of Hunan Province, Huaihua University, Hunan, Huaihua, P. R. China