1. School of Life Sciences, Hainan University, Haikou, Hainan, P.R. China
2. Hainan Key Laboratory of Research and Development of Natural Product from Li Folk Medicine, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan, P.R. China
3. Hainan Institute for Tropical Agricultural Resources, Haikou, Hainan, P.R. China