1. School of Pharmacy; East China University of Science & Technology; Shanghai 200237 China
2. Division of Anti-Tumor Pharmacology; State Key Laboratory of Drug Research; Shanghai Institute of Materia Medica; Shanghai 201203 China
3. Department of Gastroenterology; The First Affiliated Hospital of Zhengzhou University; Zhengzhou Henan Province 450014 China
4. Department of Medicinal Chemistry; China Pharmaceutical University; Nanjing 210009 China
5. Drug Discovery and Design Center; State Key Laboratory of Drug Research; Shanghai Institute of Materia Medica; Shanghai 201203 China
6. Department of Medicinal Chemistry; Shanghai Institute of Materia Medica; Shanghai 201203 China