Key Laboratory of Pesticide and Chemical Biology Ministry of Education College of Chemistry Central China Normal University Wuhan 430079 P. R. China<&wdkj&>Department of Chemistry and Biochemistry University of Maryland College Park MD 20742 USA<&wdkj&>Department of Cell Biology and Molecular Genetics University of Maryland College Park MD 20742 USA<&wdkj&>Department of Chemistry and RECETOX Masaryk University, Kamenice 5 625 00 Brno Czech Republic