1. Medicinal Chemistry Department, BioFocus, Chesterford Research Park, Cambridge, CB10
1XL, U.K.
2. Galapagos NV, Generaal de Wittelaan, 2800 Mechelen,
Belgium
3. Laboratory of
Virology and Chemotherapy,
Rega Institute for Medical Research, University of Leuven, Leuven, Belgium