1. Institute
of Pharmacy and Food Chemistry, University of Wuerzburg, Am Hubland, D-97074 Wuerzburg, Germany
2. Rudolf Virchow Center for Experimental Biomedicine, Institute
for Structural Biology, University of Wuerzburg, Josef-Schneider-Str. 2, D-97080 Wuerzburg, Germany
3. Institute for Chemical Biology & Drug Discovery, Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States