We thank S. Ahmed, J. Apostolakis, N. Budin and C. Ehrhardt for helpful discussions, and A. Widmer (Novartis Pharma Inc., Basel) for the molecular modelling program WITNOTP which was used for visual analysis of the results and for preparing the Figures 2,4, and 6. This work was supported by the Swiss National Science Foundation (Nationalfonds, Grant No. 31 -53604.98), the Helmut Horten Foundation, and the EMDO Foundation. The program SEED (for SGI or PC running the Linux operating system), as well as the library of fragments in mol2 format, is available for non profit institutions from the last author (e-mail: [email protected]).

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