1. Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, P. R. China
2. School of Pharmacy, Guangxi Medical University, Nanning, Guangxi 530021, P. R. China
3. Department of Biochemistry and Molecular Medicine, UC Davis Comprehensive Cancer Center, University of California—Davis, Sacramento, California 95817, United States
4. Department of Internal Medicine, Hospital of Shandong University, Jinan, Shandong 250012, P. R. China