1. Department of Pharmacology, Nanjing Medical University, Nanjing, P.R. China,
2. Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing, P.R. China,
3. Department of Pharmacology, Emory University School of Medicine, Atlanta, GA, USA, and
4. Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing, P.R. China