1. Department Chemistry and Biochemistry Clemens-Schöpf-Institute Technical University Darmstadt Alarich-Weiss Straße 4 64287 Darmstadt Germany
2. Institute of Biophysical Chemistry Center for Biomolecular Magnetic Resonance and Cluster of Excellence Macromolecular Complexes (CEF) Goethe University Max-von-Laue-Straße 9 60438 Frankfurt am Main Germany