1. Research and Development of Natural Product from Li Folk Medicine, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agriculture Sciences, Haikou 571101, China
2. College of Life Science, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education, Hebei University, Baoding 071002, China
3. New Drug Research and Development Center, North China Pharmaceutical Group Corporation, Shijiazhuang 050015, China
4. Qingdao Cancer Institute, the Affiliated Hospital of Qingdao University, Qingdao 266061, China