1 Department of Drug Design, University of Groningen, Antonius Deusinglaan 1, Postbus 196, 9700 AD Groningen, Netherlands, Homepage: www.drugdesign.nl.
2 Carmolex Inc., 2000 Technology Drive Suite 100, Pittsburgh, Pennsylvania 15219 United States, Homepage: www.carmolex.com.
3 Department Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching bei Munchen, Germany.