1. Consorzio Interuniversitario di Risonanze Magnetiche di Metallo Proteine , Via Luigi Sacconi 6, 50019 Sesto Fiorentino , Italy
2. Department of Chemistry and Magnetic Resonance Center (CERM), University of Florence , Via Luigi Sacconi 6, 50019 Sesto Fiorentino , Italy
3. Department of Chemistry, University of Bari “Aldo Moro,” Via Orabona 4, 70125 Bari , Italy