1. Department of Chemistry, University of Bari “Aldo Moro”, via Orabona, 4, 70125 Bari, Italy
2. Institute of Crystallography, CNR, via Amendola, 122/o, 70126 Bari, Italy
3. Bioorganic Chemistry and Bio-Crystallography laboratory (B(2)Cl), Faculty of Science and Technology, Free University of Bolzano, Piazza Università 5, 39100 Bolzano, Italy
4. Institute of Crystallography, CNR, Area Science Park Basovizza, 34149 Trieste, Italy