1. Department
of Chemistry, Willard H. Dow Laboratories, University of Michigan, Ann Arbor, Michigan 48109, United States
2. Centre
de Biophysique Moléculaire, CNRS, UPR 4301, 45071 Orléans Cedex 2, France
3. Le STUDIUM® Loire Valley Institute for Advanced Studies, 1 Rue Dupanloup, 45000 Orléans, France
4. Department
of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States