1. Department of Chemistry, George Washington University, Washington, District of Columbia 20052, United States
2. Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri 63110, United States
3. Department of Chemistry and Biochemistry, George Mason University, Manassas, Virginia 20110, United States
4. Tuberculosis Research Section, LCIM, NIAID/NIH, Bethesda, Maryland 20892, United States
5. Department of Chemistry, Saint Louis University, St. Louis, Missouri 63103, United States