1. Department of Pharmaceutical Chemistry, University of California, 600 16th Street, San Francisco, California 94143, United States
2. Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
3. Departments of Chemistry and Biology, Viva Biotech, Pu Dong New Area, 201203 Shanghai, China
4. Department of Chemistry, University of Turku, 20500 Turku, Finland
5. Departments of Chemistry and Structural Biology, Elgia Therapeutics, La Jolla, California 92037, United States