Two new O- and C-glycosylxanthones from Gentiana tizuensis Franch †

Two new xanthone glycoside, 3-O-beta-D-glucopyranosyl-1,6-dihvdroxy xanthone 1 and 3-C-beta-D-glucopyranosyl-1-hydroxy-7-methoxvxanthone 2 have been isolated from the aerial parts of Gentiane, tizzuensis. Their structures have been established by spectroscopic studies (FABMS, H-1 NMR, C-13 NMR, DEPT and COSY) and by comparison with closely related compounds.