1. Center
for Theoretical Chemistry, Faculty of Chemistry and Biochemistry, Ruhr-University, 44780 Bochum, Germany
2. Max-Planck Institut für Kohlenforschung, 45470 Mülheim an der Ruhr, Germany
3. Department of Chemistry and Biochemistry
and Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, California 93106, United States
4. Department
of Biochemistry and Molecular Biology, Zilkha Neurogenetic Institute,
Keck School of Medicine, University of Southern California, Los Angeles, California 90089, United States