Isolation and Structure Elucidation of a New Flavonol Glycoside from Sophora japonica

Abstract

A new flavonol glycoside, quercetin-3-O-(4″-galloyl)-α-L-rhamnopyranoside (1), along with two known ones, kaempferol-3-O-β-D-glucopyranoside (2) and quercetin-3-O-rutinoside (3), were isolated from the root barks of Sophora japonica. The chemical structures of the isolated compounds were elucidated by spectroscopic analysis, including extensive 1D and 2D NMR and MS techniques.