1. Roche Bioscience, 3401 Hillview Avenue, Palo Alto, California 94304
2. Affymax Inc., 4001 Miranda Avenue, Palo Alto, California 94304
3. Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
4. Department of Chemistry, University of Tartu, 2 Jakobi Str., Tartu, Estonia