1. Department of Applied Microbiology, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, Sofia, Bulgaria;
2. Department of Botany, Faculty of Biology, University of Plovdiv “Paisii Hilendarski”, Plovdiv, Bulgaria;
3. Laboratory Chemistry of Natural Products, Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria;
4. Department of Analytical Chemistry and Computer Chemistry, Faculty of Chemistry, University of Plovdiv “Paisii Hilendarski”, Plovdiv, Bulgaria;
5. Laboratory Bulgarian NMR Centre, Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria