Fig. 1

Chemical structures of tested compounds. Atalantoflavone (1); 2′-hydroxyatalantoflavone (2); neocyclomorusin (3); 2-(3,5-dihydroxyphenyl)benzofuran-5,6-diol (4); 4-hydroxy-2,6-di-(3′,4′-dimethoxyphenyl)-3,7-dioxabicyclo-(3.3.0)octane (5); Candidone (6); isoneorautenol (7); neobavaisoflavone (8); tecleaverdoornine (9); maculine (10); deacetylnomilin (11); daidzein (12); isowighteone (13); dorstenin (14); herranone (15); 2-(penta-1,3-diynyl)-5-(3,4-dihydroxybut-1-ynyl)thiophene (17); isogarcinol (16); ulmoside A (18) and 3,4,3′-tri-O-methylellagic acid (19)