1. Institute of Technology of Organic Chemistry, Faculty of Materials Science and Applied Chemistry, Riga Technical University, P. Valdena str. 3, Riga, Latvia
2. Latvian Institute of Organic Synthesis, Aizkraukles str. 21, Riga, Latvia
3. Department of Chemistry, Ludwig-Maximilian University of Munich, Butenandtstr. 5-13(D), 81377 Munich, Germany