1. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
2. Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
3. Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
4. Department of Infection, Computational Sciences, AstraZeneca Pharmaceuticals LP, Wilmington Delaware 19850, United States
5. Department of Chemical and Environmental Engineering, The University of Arizona, Tucson, Arizona 85721-0072, United States