1. Laboratorium für Physikalische Chemie ETH Zürich Vladimir-Prelog-Weg 2 8093 Zürich Switzerland
2. IBCP BMSSI 7 Passage du Vercors 69007 Lyon France
3. Institute of Biophysical Chemistry Center for Biomolecular Magnetic Resonance Goethe University Frankfurt am Main 60438 Frankfurt am Main Germany
4. Department of Chemistry Tokyo Metropolitan University Hachioji Tokyo 1920397 Japan