new flavonoid glycoside from vicia faba l.

Kaempferol 4´-o-α-rhamnopyranosyl-3-o-α-rhamnopyranosyl-(1→6)-β-glucopyranoside (1), a new flavonoid glycoside, along with eight known ones (2-9) were isolated from the flowers of vicia faba l. (leguminosae) which were identified as kaempferol 3-o-α-arabinopyranosyl-5-o-α-rhamnopyranoside (2), kaempferol 7-o-α-rhamnopyranoside (3), kaempferol 3-o-α-arabinopyranosyl-7-o-α-rhamnopyranoside (4), kaempferol 3-o-rutinoside (5), kaempferol 3-o-α-rhamnopyranosyl-(1→3)-β-galactopyranosyl-7-o-α-rhamnopyranoside (6), kaempferol-3-o-β-galactopyranosyl-7-o-α-rhamnopyranoside (7), kaempferol-3-o-α-rhamnopyranosyl(1→6)-β-galactopyranosyl-7-o-α-rhamnopyranoside (8) in addition to a quercetin derivative; quercitin-3´-o-α-rhamnopyranosyl-4´-(3´´-acetyl)-β-galactopyranoside (9). structure elucidation of the new compound was established based on 1d and 2d nmr analyses including 1h-, 13c-nmr, and hmbc experiments, in addition to hr-tof-ms spectrometry using matrix assisted laser desorption ionization (maldi).