1. Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia
2. Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, Tallinn, Harju Maakon 12618, Estonia
3. Unidad BICS, Centro de Investigaciones Biologicas Margarita Salas, Consejo Superior de Investigaciones Cientificas, Ramiro de Maeztu 9, Madrid 28040, Spain