1. Department of Pharmaceutical Organic Chemistry Faculty of Pharmacy Cairo University Cairo 11562 Egypt
2. Department of Chemistry Wayne State University 5101 Cass Avenue Detroit MI 48202 USA
3. Department of Pharmacy and Biomedical Sciences and Department of Chemistry and Complex Carbohydrate Research Center University of Georgia 250 West Green Street Athens GA 30602 USA
4. Institute of Medical Microbiology University of Zurich Gloriastrasse 28 8006 Zürich Switzerland
5. Department of Pathology and Laboratory Medicine Medical University of South Carolina Walton Research Building, Room 403-E 39 Sabin Street Charleston SC 29425 USA
6. Kresge Hearing Research Institute Department of Otolaryngology University of Michigan 1150 West Medical Center Drive Ann Arbor MI 48109 USA
7. Organic Chemistry Laboratory ETH Zürich Vladimir-Prelog-Weg 1–5/10 8093 Zürich Switzerland