1. Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
2. Bruker Biospin Corporation, 15 Fortune Drive, Billerica, Massachusetts United States
3. Leibniz-Institut für Molekulare Pharmakologie, Robert-Roessle-Straße 10, 13125 Berlin, Germany
4. Centre
de RMN à Très Hauts Champs, Institut des Sciences Analytiques, UMR 5280 CNRS/Ecole Normale Supérieure de Lyon, 5 rue de la Doua, 69100 Villeurbanne (Lyon), France