1. Department of Chemistry, Philipps-University of Marburg, Hans-Meerwein-Str.
Bldg. H, D-35032 Marburg, Germany
2. Department of Structural Biology, Max Planck Institute of Biophysics, Max-von-Laue-Str. 3, D-60438 Frankfurt,
Germany
3. Material Sciences Center, Hans-Meerwein-Str. Bldg. H, D-35032
Marburg, Germany