1. a School of Chemistry , University of Bristol , Bristol , BS8 1TS , UK
2. b Molecular Design & Informatics , N.V. Organon, PO Box 20, 5430 , Oss , BH , The Netherlands
3. c Wroclaw University of Technology , Wyb. Wyspianskiego 27, 50-370 , Wroclaw , Poland
4. d Institut für Pharmazeutische Chemie, Heinrich-Heine-Universität , 40 225 , Düsseldorf , Germany