Lignans from bark of the Olea plants. II.

Four new lignans, (+)-1-acetoxypinoresinol-4'-β-D-glucoside (1), (+)-1-acetoxypinoresinol-4'-β-D-glucoside 4"-O-methyl ether (2), (+)-1-hydroxypinoresinol-1-β-D-glucoside (4) and (+)-fraxiresinol-1-β-D-glucoside (5), and a known lignan, (+)-1-hydroxypinoresinol-4'-β-D-glucoside (3), were isolated from the bark of Olea europaea L. and the bark of Olea africana MILL. (Olea europaea L. subsp. africana (MILL.) GREEN) (Oleaceae). Their structures were elucidated on the basis of spectroscopic analysis and chemical evidence. The bark of Olea capensis L. did not yield any lignan glucosides.