1. Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
2. Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482, United States
3. Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
4. Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-14195 Berlin, Germany
5. Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic