1. Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, Jiangsu Normal University, Xuzhou 221116, China
2. Natural Product Research Laboratories, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7568, USA
3. Natural Products Research Institute, Kaohsiung Medical University, Kaohsiung, Taiwan
4. Chinese Medicine Research and Development Center, China Medical University and Hospital, Taichung, Taiwan