1. Laboratory of Analytical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia (S.M., A.D., K.L.); and Laboratory for Study of Interactions of Biomacromolecules, Division of Chemistry and Biochemistry, Ruđer Bošković Institute, P.O.B. 1016, HR-10000 Zagreb, Croatia (M.R.S., I.P.)