1. Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, 44 West Culture Road, 250012 Jinan, Shandong, P. R. China
2. Department of Molecular Medicine, University of Padova, Via Gabelli 63, 35121 Padova, Italy
3. Institute of Poultry Science, Shandong Academy of Agricultural Sciences, 202 North Gongye Road, 250100 Jinan, Shandong, P. R. China