1. Synthetic Bioactive Molecules Section, Laboratory of Bioorganic Chemistry, NIDDK, National Institutes of Health, Bethesda, Maryland 20892, United States
2. National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850, United States
3. Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892, United States
4. Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, Maryland 20850, United States
5. Reaction Biology Corporation, 1 Great Valley Parkway, Suite 2, Malvern, Pennsylvania 19355, United States
6. Molecular Pharmacology Laboratories, Applied and Developmental Research Directorate, Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702, United States