1. Department of Pharmaceutical and Biomedical Sciences University of Georgia 250 West Green Street 30602 Athens, GA USA
2. Institute of Medical Microbiology University of Zurich Gloriastrasse 28 8006 Zürich Switzerland
3. Organic Chemistry Institute ETH Zürich Vladimir-Prelog-Weg 1–5/10 8093 Zürich Switzerland
4. Department of Pharmaceutical and Biomedical Sciences Department of Chemistry Complex Carbohydrate Research Center University of Georgia 250 West Green Street 30602 Athens, GA USA