Flavonol tetraglycosides and other constituents from leaves of Styphnolobium japonicum (Leguminosae) and related taxa

Analysis of foliar flavonoids in Styphnolobium japonicum revealed two flavonol tetraglycosides (3 and 7) and a known example unrecorded in this species (6). A maltol derivative, 3-hydroxy-2-methyl-4H-pyran-4-one 3-O-(4′-O-p-coumaroyl-6′-O-(3-hydroxy-3-methylglutaroyl))-β-glucopyranoside, was also obtained. The distribution of flavonol tetra- and other glycosides in species of Styphnolobium and the related taxon Cladrastis kentukea is of phylogenetic interest.