Flavonoids from the Seeds of Zizyphus jujuba var. spinosa

Eight flavonoids were isolated from the BuOH fraction of the 70% EtOH extract of Zizyphus jujuba var. spinosa seeds along with three known compounds, daucosterol (1), butyl β-D-fructofuranoside (2), and magnoflorine (4). On the basis of spectroscopic methods and comparison with literature values their structures were elucidated as 6'''-feruloylspinosin (3), nicotiflorin (5), 6'''-p-coumaroylspinosin (6), isospinosin (7), 6'''-vanilloylspinosin (8), spinosin (9), hovetrichoside C (10), and camelliaside B (11). Compounds 1, 2, 10, and 11 were isolated from this plant for the first time.