1. Department of Chemistry, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland
2. Department of experimental oncology, Institute for Oncology and Radiology of Serbia, Pasterova 14, Beograd, Republic of Serbia
3. Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11000 Belgrade, Republic of Serbia