1. Complex Carbohydrate Research Center and Department of Chemistry; The University of Georgia; 315 Riverbend Road Athens GA 30602 USA
2. Department of Chemistry; The University of Georgia; Athens GA 30602 USA
3. Department of Chemistry; The University of Alabama at Birmingham; Birmingham AL 35294 USA
4. 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