Three new flavonoid glycosides from Oxytropis myriophylla.

Three new flavonoids, myriophylloside I, II and III, were isolated from Oxytropis myriophylla (Leguminosae), together with four known flavonoid glycosides: isorhamnetin-3- O- β- d-glucoside, isorhamnetin-3- O- α- l-arabinosyl(1→6)- β- d-glucoside, quercetin and rutin. The structural elucidations of all the compounds were based on extensive spectroscopic methods, including HRESIMS and 2D-NMR experiments (HSQC, HMBC, H-H COSY and HSQC-TOCSY), UV, IR and chemical evidence, together with comparison with reference values. [ABSTRACT FROM AUTHOR]