1. Department of Medicinal Chemistry, School of Pharmaceutical of Science, Shandong University, Ji’nan, Shandong 250012, P. R. China
2. Weifang Bochuang International Biological Medicinal Institute, Weifang, Shandong 261061, P. R. China
3. Shandong Academy of Pharmaceutical Sciences, Ji’nan, Shandong 250101, P. R. China
4. Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, Medical University of South Carolina, Charleston, South Carolina 29425, United States