1. State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 555 Zuchongzhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, People’s Republic of China, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, People’s Republic of China, and Department of Pharmaceutics and Industrial Pharmacy, University of Ibadan, Ibadan, Nigeria