1. Department
of Chemistry, Zhejiang University, Hangzhou 310028, China
2. Jiangsu Coben Pharmaceutical Co., Ltd, Qidong, Jiangsu 310004, P. R. China
3. College
of Pharmaceutical Sciences, Qiqihar Medical University, Qiqihar 161006, P. R. China
4. State
Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, P. R. China