14-decarboxyquinovic and quinovic acid glycosides from Zygophyllum album

Further investigation of the leaves and stems of Zygophyllum album afforded four triterpene glycosides which were characterized as 14-decarboxyquinovic acid-3β- O-β- d-quinovopyranosyl (1→4)-quinovopyranoside, quinovic acid 28- O-β- d-glucopyranosyl (2→1)β- d-glucopyranosyl ester, quinovic acid 27-β- d-glucopyranosyl(2→1)β- d-glucopyranosyl ester and quinovic acid-3-β- O-glucopyranosyl(2→1)rhamnopyranoside. In addition, two flavonoid glycosides were isolated. The structures of the isolated compounds were established by GC, GC-MS, mass spectra, 1H and 13C NMR.