1. Institute of Pharmacy, Faculty of Chemistry
and Pharmacy, University of Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
2. Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich Alexander University, Schuhstrasse 19, D-91052 Erlangen, Germany
3. Institut de Pharmacologie et Biologie Structurale, CNRS/IPBS, 205 route
de Narbonne, 31077 Toulouse cedex 5, France
4. Department of Molecular
Biology, University of Salzburg, Billrothstrasse 11, A-5020 Salzburg, Austria
5. Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium