1. Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, P.R. China
2. Department of Pharmacy, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, P.R. China
3. Department of Pharmacy, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, P.R. China
4. Department of Pharmacology and Cancer Biology, Duke University, Durham, North Carolina 27710, United States