1. Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 542/2, 160 00 Prague, Czech Republic
2. Faculty of Science, Department of Analytical Chemistry, Charles University, Albertov 2030, 12840 Prague 2, Czech Republic
3. York Structural Biology Laboratory, Department of Chemistry, The University of York, Heslington, York YO10 5DD, United Kingdom