1. Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, GA 30602, USA
2. Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, USA
3. Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA
4. Institute of Medical Microbiology, University of Zurich, Gloriastrasse 28, 8006 Zürich, Switzerland
5. Organic Chemistry Laboratory, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland
6. Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, GA 30602, USA