1. Departments of Chemistry, Molecular Biosciences, Neurobiology and Radiology, Northwestern University, 2145 N. Sheridan Road, Evanston, Illinois60208, United States
2. Laboratory of Organic Chemistry, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, Zürich8093, Switzerland
3. Magnetic Resonance Center (CERM), University of Florence, via Luigi Sacconi 6, Sesto Fiorentino50019Italy
4. Department of Chemistry “Ugo Schiff”, University of Florence, via della Lastruccia 3, Sesto Fiorentino50019, Italy
5. Consorzio Interuniversitario Risonanze Magnetiche Metallo Proteine (CIRMMP), via Luigi Sacconi 6, Sesto Fiorentino50019, Italy