1. Institute of Biochemistry, Biocenter, Goethe University Frankfurt, Frankfurt/M., 60438, Germany
2. Centre for Computational Science, University College London, London, WC1H0AJ, England, U.K.
3. Department of Chemistry, Institute for Structural and Molecular Biology, University College London, London, WC1H0AJ, England, U.K.
4. Molecular Electronics, Technical University of Munich, Munich, 80333, Germany
5. School of Physical Sciences, University of California, Irvine, California 92697, United States
6. Fraunhofer Research Institution for Microsystems and Solid State Technologies (EMFT), Munich, 80686, Germany
7. Center of NanoScience (CeNS), Ludwig-Maximilian-University, Munich, 80539, Germany
8. Informatics Institute, University of Amsterdam, Amsterdam, 1090 GH, The Netherlands