Notes
Two New Flavonol Glycosides from Otostegia limbata BENTH.
2009 Volume 57 Issue 3 Pages 276-279
Details
2009 Volume 57 Issue 3 Pages 276-279
A BuOH-soluble part of the methanolic extract from the roots of Otostegia limbata yielded two new flavonol glycosides; kaempferol 3-O-[β-D-glucopyranosyl-(1→2)-{β-D-glucopyranosyl-(1→3)}-{β-D-glucopyranosyl-(1→4)}-α-L-rhamnopyranoside]-7-O-[α-L-rhamnopyranoside] (1) and kaempferol 3-O-[β-D-glucopyranosyl-(1→4)-β-D-6″‴[4-hydroxy (E)-cinnamoyl]glucopyranosyl-(1→3)-{β-D-glucopyranosyl-(1→2)}-α-L-rhamnopyranoside]-7-O-[α-L-rhamnopyranoside] (2). The structures of these compounds were elucidated by spectroscopic and chemical means. To the best of our knowledge, these are the largest flavonoids derivatives described so far from the genus Otostegia.
