| Abstract: | Nine known compounds, 5-hydroxy-4′,7-dimethoxy-6,8-dimethylflavone, 4′,5-dihydroxy-7-methoxy-6,8-dimethylflavone, 3β-hydroxy-urs-11-ene-28-oic-13(28)-lactone, 3β-acetoxy-urs-11-ene-28-oic-13(28)-lactone, uvaol, β-sitosterol, 7β-O-glucoside of 5,7-dihydroxy-2-methylchromone, 1-triacontanol and 1-triacontanoic acid, and a new acylphloroglucinol named robustaol B 6 were isolated from the leaves of Eucalyptus robusta Sm. 6 was shown to be 4,6-dihydroxy-2-methoxy isobutyrophenone by spectral analyses and was confirmed by synthesis. 6 showed inhibition against Staphylococcus aureus 209P and Bacillus subtilis 6633 in vitro. |
