1. Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 20, Post Office Box 177, HR-10000 Zagreb, Croatia, Division of Molecular Medicine, “Ruđer Bošković” Institute, Bijenička cesta 54, Post Office Box 180, HR-10000 Zagreb, Croatia, and Division of Organic Chemistry and Biochemistry, “Ruđer Bošković” Institute, Post Office Box 180, HR-10002 Zagreb, Croatia