1. Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102A, 10000 Zagreb, Croatia
2. Institute of Organic Chemistry and Biochemistry of the CAS, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
3. Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
4. Department of Chemistry, University of Colorado, Boulder, Colorado 80309-0215, USA