Four new xanthones have been isolated from the roots of Hypericum roeperanum. Their structures have been established by a combination of spectroscopic and chemical methods as 1, 6-dihydroxy-5-methoxy-4′, 5′-dihydro-4′, 4′, 5′-trimethylfurano-(2′, 3′: 3, 4)- xanthone (5-O-methyl-2-deprenylrheediaxanthone B), 1, 6-dihydroxy-5-methoxy-6′, 6′- dimethylpyrano-(2′, 3′: 3, 4)-xanthone (5-O-methylisojacareubin), 1, 3, 5, 6- ...
