1. Institute of Physical and Theoretical ChemistryInstitute of Biophysical ChemistryCenter for Biomolecular Magnetic Resonance (BMRZ)Goethe University Frankfurt Max-von-Laue-Str. 7–9 60438 Frankfurt am Main Germany
2. Fachbereich BiologieTechnische Universität Darmstadt Schnittspahnstraße 10 64287 Darmstadt Germany
3. Institute of Physical and Theoretical ChemistryGoethe University Frankfurt Max-von-Laue-Str. 7 60438 Frankfurt am Main Germany