1. Graduate Institute of Pharmaceutical Chemistry, China Medical University, Taichung, Taiwan
2. Institute of Cellular and Organismic Biology, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei 115, Taiwan
3. School of Biological Science and Technology, China Medical University, Taichung, Taiwan
4. Taiwan Advance Biopharm, Inc., 12F, No. 25, Lane 169, Kangning Street, Xizhi City, Taipei 221, Taiwan
5. Natural Products Research Laboratories, Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599-7568, United States