1. Contribution from the Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium, Institute for Biological Information Processing, IBI-1, Research Centre Jülich, D-52425 Jülich, Germany, Institute for Biological Information Processing, IBI-2, Research Centre Jülich, D-52425 Jülich, Germany, Rega Institute for Medical Research, Faculty of Pharmaceutical Sciences, Katholieke Universiteit Leuven, Minderbroedersstraat 10, 3000 Leuven, Belgium, Centre of Microbial...