Quercetin and Kaempferol Glycosides from Ficaria verna Flowers and Tgheir Structure Studied by 2D NMR Spectroscopy

From the flowers of Ficaria verna Huds. (Ranunculaceae), two flavonol triglycosides were isolated and their structures were elucidated by spectroscopic analysis (UV, NMR, MS) as 3-O-[_-L-rhamnopyranosyl-(1_6)-_-D-glucopyranosyl]-7-O-(_-D-glucopyranosyl) - quercetin (1) and 3-O-[_-L-rhamnopyranosyl-(1_6)-_-D-glucopyranosyl]-7- O-(_-D-glucopyranosyl) - kaempferol (2). In addition, the structure of 1 was determined using homo- and heteronuclear 2D NMR techniques.