1. Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Shandong University, 44 West Culture Road, 250012 Ji’nan, Shandong, P. R. China
2. Department of Clinical Pharmacy, Qilu Hospital of Shandong University, 250012 Ji’nan, China
3. Pharmaceutical Institute, Pharmaceutical Chemistry II, University of Bonn, 53121 Bonn, Germany
4. Department of Physics, Chemistry, and Pharmacy, University of Southern Denmark, DK-5230 Odense M, Denmark
5. Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, K.U. Leuven, Herestraat 49 Postbus 1043 (09.A097), B-3000 Leuven, Belgium