1. University of Vienna, Institute of Inorganic Chemistry, Austria, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, Switzerland, Department of Chromosome Biology, Max F. Perutz Laboratories, University of Vienna, Austria, Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia, and Department of Pharmaceutical and Medicinal Chemistry, University of Greifswald, Germany