Affiliation: | 1. Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, 9000 Gent (Belgium), Fax: (+32)?9‐264‐6697;2. Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Gent (Belgium), Fax: (+32)?9‐264‐6243 |