New Quercetin Triglycoside from the Leaves of Soybean Cultivar Clark'

A new flavonol triglycoside, Quercetin 3-O--rhamnopyranosyl-(14)-[-rhamnopyranosyl-(16)--galactopyranoside], was isolated from the leaves of soybean (Glycine max) cultivar Clark and identified by UV spectra, LC-ESI-MS, acid hydrolysis, and H-1 and C-13 NMR. The compound was found together with 7 known flavonol glycosides, quercetin 3-O-robinobioside, quercetin 3-O-rutinoside, kaempferol 3-O-rhamnosyl-(14)-[rhamnosyl-(16)-galactoside], kaempferol 3-O-robinobioside, kaempferol 3-O-rutinoside, isorhamnetin 3-O-robinobioside, and isorhamnetin 3-O-rutinoside.