1. Xemistry GmbH, Hainholzweg
11, D-61462 Königstein, Germany
2. National Center for Biotechnology Information, U.S.
National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda Maryland 20894,
United States
3. Advanced
Structure Analysis Collaboratory, Information Systems Program, SAIC-Frederick,
Inc., National Cancer Institute at Frederick, Frederick, Maryland 21702, United States