1. Department of Chemistry; Innovative Drug Research Center; Shanghai University; 200444 Shanghai P. R. China
2. Laboratory for Microstructures; Instrumental Analysis and Research Center; Shanghai University; 200444 Shanghai P. R. China
3. State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 200032 Shanghai P. R. China
4. Key Laboratory of Synthetic Organic Chemistry of Natural Substances; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 200032 Shanghai P. R. China
5. Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 200032 Shanghai P. R. China