Flavonol glycosides from the leaves of Astragalus microcephalus

Four new flavonol glycosides were isolated from the leaves of Astragalus microcephalus. The structures of the new compounds were established as Isorhamnetin-3-O- [β-D-apiofuranosyl (1→3)]-β-D-glucopyranoside (Microcephalin I), Isorhamnetin-3-O- [α-L-rhamnopyranosyl (1→3)]-β-D-glucopyranoside (Microcephalin II), Their strucrures were totally elucidated based on spectroscopic methods, 1D- (1H, 13C, 13C DEPT) and 2D- NMR experiments as well as UV spectra analysis..