1. Institute of Environmental Science, Shanxi Laboratory for Yellow River, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, P. R. China
2. College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
3. Department of Chemistry, Centre for Biotechnology, Brock University, St. Catharines, Ontario L2S 3A1, Canada
4. Laboratory Animal Center, Shanxi Cancer Hospital, Taiyuan 030013, P. R. China