1. Institute for Drug Research; School of Pharmacy; Hebrew University of Jerusalem; Jerusalem IL 91120 Israel
2. Department of Inorganic and Analytical Chemistry; Hebrew University of Jerusalem; Jerusalem 91904 Israel
3. Laboratorio di Chimica Bioinorganica; Universita degli Studi di Firenze; Polo Scientifico, Rm. 188, Via della Lastruccia 3 I-50019 Sesto Fiorentino Florence Italy