1. Department of Pharmaceutical Chemistry, Institute of Pharmacy and Center for Molecular Biosciences (CMBI), University of Innsbruck, Innrain 52, A-6020 Innsbruck, Austria, and Inte:Ligand Software-Entwicklungs- und Consulting GmbH, Clemens Maria Hofbauer-Gasse 6, A-2344 Maria Enzersdorf, Austria