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Nine known compounds, 5-hydroxy-4’,7-dimethoxy-6, 8-dimethylflavone, 4’,5-dihydroxy-7-methoxy-6, 8-dimethyIflavone, 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, I-triacontanol and I-triacontanoic acid, and a new acylphloroglucinol namedrobustaol 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 showedinhibition against Staphylococcus aureus 209P and Bacillus subtilis 6633 in vitro.
Nine known compounds 5-hydroxy-4 ’, 7-dimethoxy-6, 8-dimethylflavone, 4’, 5-dihydroxy- 7-methoxy-6, 8-dimethyIflavone, (28) -lactone, uvaol, β-sitosterol, 7β-O-glucoside of 5,7-dihydroxy-2- methylchromone, I-triacontanol and I-triacontanoic acid, and a new acylphloroglucinol namedrobustaol B 6 were isolated from the leaves of Eucalyptus robusta Sm. 6 was shown to 4,6-dihydroxy-2-methoxy isobutyrophenone by spectral analyzes and was confirmed by synthesis. 6 showed inhibition against Staphylococcus aureus 209P and Bacillus subtilis 6633 in vitro.