1. Dipartimento Farmaco-Chimico, Università di Messina, Viale Annunziata, I-98168 Messina, Italy
2. Laboratorio di Chimica Bioinorganica, Università degli Studi di Firenze, Firenze, Italy
3. Department of Structural Biology, Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, CZ-16637 Prague, Czech Republic
4. Department of Structural Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, CZ-16637 Prague, Czech Republic