1. Faculty of Medicine and Life Sciences, University of Latvia, Jelgavas 1, Riga LV1001, Latvia
2. Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV1006, Latvia
3. Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, Hamburg 22607, Germany
4. Institute of Inorganic and Analytical Chemistry, Goethe University, Max-von-Laue-Str. 7, Frankfurt am Main 60438, Germany