1. Department of Chemical Biology and Drug Discovery Utrecht Institute for Pharmaceutical Sciences and Bijvoet Center for Biomolecular Research Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
2. Complex Carbohydrate Research Center and Department of Chemistry University of Georgia 315 Riverbend Road Athens GA 30602 USA
3. Department Biomolecular Health Sciences Utrecht University Yalelaan 1 3584 CL Utrecht The Netherlands