1. Department of Chemistry and Applied Biosciences
2. Swiss Federal Institute of Technology (ETH Zürich)
3. CH-8093 Zürich
4. Switzerland
5. Dipartimento di Chimica e Tecnologie del Farmaco
6. Structural Biology Group
7. European Synchrotron Radiation Facility
8. 38000 Grenoble
9. France
10. CNRS