[Studies on xanthones from aerial parts of Polygala sibirica].

OBJECTIVE To investigate the chemical constituents of the aerial parts of Polygala sibirica systematically. METHODS The chemical constituents were isolated by various column chromatographic methods. The structures were identified by spectral data. RESULT Ten compounds were isolated and identified as 6-hydroxy-1, 2, 3, 7-tetramethoxy xanthone (1); 1, 2, 3, 6, 7-heptamethoxy xanthone (2); 1, 7-didydroxy-2, 3-methylenedioxy xanthone (3); 1, 7-dihydroxy-2, 3-dimethoxy xanthone (4); 1, 3, 7-trihydroxy-2-methoxy xanthone (5); 1, 6, 7-trihydroxy-2, 3-dimethoxy xanthone (6); alpha-spinasterol (7); alpha-spinasterolic-3-O-beta-D-glucoside (8); squalene (9) and polygital (10). CONCLUSION Compounds 1-10 were isolated from this species for the first time.