1. Chemical Biology of Carbohydrates (CBCH), Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research, D-66123 Saarbrücken, Germany
2. Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover-Braunschweig, Germany
3. Department of Chemistry, Saarland University, D-66123 Saarbrücken, Germany
4. Chemical Biology (CBIO), Helmholtz Centre for Infection Research (HZI), Helmholtz Centre for Infection Research, D-38124 Braunschweig, Germany