1. The National Center for Drug Screening, Shanghai Institute of Materia Medica and Graduate School, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China
2. State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, Nanjing University, Nanjing 210093, People's Republic of China
3. Laboratory of Gastroenterology, Ministry of Public Health, Renji Hospital, Shanghai Second Medical University, Shanghai 200001, People's Republic of China
4. Shanghai East Best Biopharmaceutical Enterprises Co., Ltd., Shanghai 200233, People's Republic of China