New flavan and unusual chalcone glycosides from Drypetes parvifolia

Two new compounds 7-hydroxy-5- O -(β- d -glucopyranoside) flavan ( 1 ) and ( Z )-4′,6′-dihydroxy-2′- O -(β- d -glucopyranoside) chalcone ( 2 ), along with eight known compounds, were isolated from the stem bark of Drypetes parvifolia (Euphorbiaceae). Their structures were established on the basis of spectroscopic analysis and chemical evidence.