Flavonoids from Astragalus hamosus

A new flavonol glycoside 7-O-methyl-kaempferol 4'-beta-D-galactopyranoside ( rhamnocitrin 4'-beta-D-galactopyranoside) ( 1) was isolated from the aerial parts of Astragalus hamosus. The known flavonols hyperoside ( 2), isoquercitrin ( 3) and astragalin ( 4) were also identified. Structures of the compounds were elucidated by chemical and spectral methods.