1. Computer-Chemistry-Center, Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nuernberg, Naegelsbachstr. 25, 91052 Erlangen, Germany
2. Institute of Medical Physics and Biophysics, Faculty of Medicine, University of Leipzig, Leipzig 04107, Germany
3. Pharmaceutical Sciences, University of Geneva, CH1206 Geneva, Switzerland
4. Institute of Pharmaceutical Sciences of Western Switzerland, CH1206 Geneva, Switzerland
5. Chemistry Department, University College London, WC1H 0AJ London, U.K.