\n\t\tSummary

\n\t\tStudy on Flavonoids in Ban (Hypericum  japonicum Thunb. ex Murr.)

\n\t\tThree  flavonoids (quercetin,  quercitrin and rutin) have been isolated from Hypericum japonicum Thunb. ex Murr. gathered in Hatay-Vietnam. Their structures were determined on the basis of spectroscopic data.

\n\t\tKey words: Hypericum japonicum, flavonoid, quercetin, quercitrin, rutin.