1. Department of Chemistry, The University of Hawai’i at Manoa, Honolulu, Hawaii 96822, United States
2. Department of Chemistry, University of Washington, Seattle, Washington 98105, United States
3. Laboratoire International Associé Centre National de la Recherche Scientifique et University of Illinois at Urbana−Champaign, Unité Mixte de Recherche n°7019, Université de Lorraine, B.P. 70239, Vandœuvre-lès-Nancy Cedex 54506, France
4. Theoretical and Computational Biophysics Group, Beckman Institute, and Department of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
5. Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois 60637, United States