1. Department of Chemistry, George Washington University, Washington, D.C. 20052, USA
2. Division of Infectious Diseases, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
3. Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
4. Tuberculosis Research Section, LCIM, NIAID/NIH, Bethesda, MD 20892, USA
5. Department of Chemistry and Biochemistry, George Mason University, Fairfax, VA 22030, USA