1. Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, 10 000 Zagreb, Croatia
2. NMR Center, Ruđer Bošković Institute, Bijenička 54, 10 000 Zagreb, Croatia
3. Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10 000 Zagreb, Croatia