Magnetic Resonance Center (CERM).|Magnetic Resonance Center (CERM) Department of Chemistry, University of Florence, 50019 Sesto Fiorentino, Italy.|Magnetic Resonance Center (CERM) Department of Chemistry, University of Florence, 50019 Sesto Fiorentino, Italy.|Magnetic Resonance Center (CERM) Department of Chemistry, University of Florence, 50019 Sesto Fiorentino, Italy.