New Quercetin Triglycoside from the Leaves of Soybean Cultivar ‘Clark’

A new flavonol triglycoside, Quercetin 3-O-α-rhamnopyranosyl-(1→4)-[α-rhamnopyranosyl-(1→6)-β-galactopyranoside], was isolated from the leaves of soybean (Glycine max) cultivar “Clark” and identified by UV spectra, LC-ESI-MS, acid hydrolysis, and 1H and 13C NMR. The compound was found together with 7 known flavonol glycosides, quercetin 3-O-robinobioside, quercetin 3-O-rutinoside, kaempferol 3-O-rhamnosyl-(1→4)-[rhamnosyl-(1→6)-galactoside], kaempferol 3-O-robinobioside, kaempferol 3-O-rutinoside, isorhamnetin 3-O-robinobioside, and isorhamnetin 3-O-rutinoside.