1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
2. Nanjing Zenji Research Laboratories, Nanjing 211800, P. R. China
3. Shanghai institute of Materia Medica. Chinese Academy of Sciences, Shanghai 201203, P. R. China
4. Jiangsu Zenji Pharmaceuticals Ltd, Huaian 223100, P. R. China