1. Theoretical Chemistry Department of Chemistry University of Munich (LMU) Butenandtstr. 7 81377 Munich Germany
2. Dept. Chemistry Section Biochemistry Johannes Gutenberg-Universität Mainz 55128 Mainz Germany
3. Centre for Biomolecular Magnetic Resonance (BMRZ) Goethe-University Frankfurt Max-von-Laue Str. 9 60438 Frankfurt Germany
4. Institute for Physical and Theoretical Chemistry University of Würzburg Emil-Fischer-Straße 42 97074 Würzburg Germany
5. Dept. Chemistry Section Organic Chemistry Johannes Gutenberg-Universität Mainz 55128 Mainz Germany
6. Institute of Structural Biology Rudolf Virchow Center for Experimental Biomedicine University of Würzburg 97080 Würzburg Germany
7. Max Planck Institute for Solid State Research 70569 Stuttgart Germany