1. Department of Inorganic Chemistry, Faculty of Science, Universita Karlova (Charles University), Hlavova 2030, 128 40 Prague 2, Czech Republic, Biocatalysis and Organic Chemistry, Department of Biotechnology, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands, and Department of Biochemistry, Faculty of Science and Technology, Center of Neurosciences and Cell Biology, University of Coimbra, 3001-401 Coimbra, Portugal