1. State Key Laboratory of Drug Research and SIMM-CUHK Joint Research Laboratory of Promoting Globlization of Traditional Chinese Medicines, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu-Chong-Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China, and Department of Organic Chemistry, University of Debrecen, POB 20, H-4010 Debrecen, Hungary