1. Department of Chemical Sciences University of Padova via Marzolo, 1 35131 Padova Italy
2. Current address: School of Life and Health Sciences Aston University B4 7ET Birmingham UK
3. Department of Chemistry and Biochemistry University of Bern Freiestrasse 3 CH-3012 Bern Switzerland
4. Department of Pharmaceutical and Pharmacological Sciences University of Padova via Marzolo 5 35131 Padova Italy
5. Laboratory of Molecular Modeling & Drug Discovery Istituto Italiano di Tecnologia (IIT) Via Morego 30 16163 Genova Italy