Margarita Popova (Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria), Ivalina Trendafilova (Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria), Ágnes Szegedi (Research Centre for Natural Sciences, Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, 1525 Budapest, Hungary), Judith Mihály (Research Centre for Natural Sciences, Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, 1525 Budapest, Hungary), Denitsa Momekova (Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria), Spiro Konstantinov (Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria), Neli Koseva (Institute of Polymers, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria)