1. The Glycosciences Laboratory, Department of Medicine, Imperial College London, Northwick Park and St. Mark's Campus, Harrow, Middlesex HA1 3UJ, United Kingdom
2. Institute of Virology, Philipps University, Hans-Meerwein-Str. 2, 35043 Marburg, Germany
3. Division of Virology, MRC National Institute for Medical Research, Mill Hill, London NW7 1AA, United Kingdom
4. REQUIMTE, Centro de Química Fina e Biotecnologia, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
5. Department of Applied Bioorganic Chemistry, Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu, Japan