Three new flavonol malonylrhamnosides from Ribes alpinum

Abstract

Three new flavonol malonylrhamnosides, 3-O-(4″-O-malonyl)-α-L-rhamnopyranosides of mearnsetin, myricetin and quercetin respectively, together with the corresponding mearnsitrin, myricitrin, quercitrin and the 4-O-methyl phloracetophenone 2-O-β-D-glucopyranoside, were isolated from the leaves of Ribes alpinum and fully characterized by spectrocopic methods including 2D NMR.