1. Institute for Organic Chemistry and Chemical Biology Johann Wolfgang Goethe University Max-von-Laue-Str. 7 60438 Frankfurt/Main Germany
2. Center for Biomolecular Magnetic Resonance Institute for Organic Chemistry and Chemical Biology Johann Wolfgang Goethe University Max-von-Laue-Str. 7–9 60438 Frankfurt/Main Germany
3. Institute for Molecular Biosciences Johann Wolfgang Goethe University Max-von-Laue-Str. 9 60438 Frankfurt/Main Germany