1. a Laboratory of General and Inorganic Chemistry , Department of Chemistry, Faculty of Science, University of Zagreb , Horvatovac 102a , HR-10000 Zagreb , Croatia
2. b NMR Centre , Ruđer Bošković Institute , Bijenička cesta 54 , HR-10000 Zagreb , Croatia
3. c Department of Oncology and Nuclear Medicine , University Hospital Center “Sestre Milosrdnice”, School of Medicine, University of Zagreb , Vinogradska cesta 29 , HR-10000 Zagreb , Croatia
4. d Croatian Academy of Sciences and Arts , Zrinjski trg 11 , HR-10000 Zagreb , Croatia