1. Department
of Chemistry, Iowa State University, and
Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United
States
2. Department of Chemistry, North Carolina State University, Raleigh, North Carolina
27695, United States
3. Weldon
School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United
States
4. Department of Pharmaceutical
Chemistry and Department of Biochemistry and Biophysics, University of California, San Francisco, California
94158, United States