1. Institute Charles Sadron; UPR22-CNRS; 23 Rue de Loess 67034 Strasbourg Cedex 2 France
2. NMR Spectroscopy; Bijvoet Center for Biomolecular Research; Utrecht University; Padualaan 8 3584CH Utrecht The Netherlands
3. Department of Chemistry; University of Potsdam; Karl-Liebknecht-Strasse 24-25 14476 Potsdam-Golm Germany
4. Fraunhofer Institute for Applied Polymer Research; Geiselbergstrasse 69 14476 Potsdam-Golm Germany