1. Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Shandong University, 44 West Culture Road, 250012 Jinan, Shandong, P.R. China
2. Rega Institute for Medical Research, Laboratory of Virology and Chemotherapy, KU Leuven, Herestraat 49 Postbus 1043 (09.A097), B-3000 Leuven, Belgium
3. China-Belgium Collaborative Research Center for Innovative Antiviral Drugs of Shandong Province, 250012 Jinan, P.R. China