1. Key
Laboratory of Medicinal Chemistry for Natural Resource, Ministry of
Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
2. Department
of Medicinal Chemistry, College of Pharmacy, and Translational Oncology
Program, University of Michigan, Ann Arbor, Michigan 48109, United States
3. Department
of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand