1. NIH Center for Macromolecular Modeling and Bioinformatics, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, 405 North Mathews Avenue, Urbana, Illinois 61801, United States
2. Department of Physics, University of Illinois at Urbana−Champaign, 1110 West Green Street, Urbana, Illinois 61801, United States
3. Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
4. Department of Chemistry, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
5. Department of Physics, Carl von Ossietzky University, Carl-von-Ossietzky-Strasse 9−11, Oldenburg 26111, Germany