1. Natural Products Research Laboratories, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina
27599-7568, United States
2. Division of Medicinal Chemistry and Natural Products, UNC Eshelman
School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599-7568, United States
3. Department of Biological Chemistry,
College of Medicine, University of California, Irvine, California 92697, United States
4. Chinese Medicine Research and Development Center, China Medical University and Hospital, Taichung, Taiwan,
Republic of China