1. Institute for Biophysical Chemistry & Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt, 60438 Frankfurt, Germany
2. ITQB NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, 2780-157 Oeiras, Portugal
3. Institute for Physical and Theoretical Chemistry & Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt, 60438 Frankfurt, Germany