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(-)-Hopeanolin (1)  was isolated from the acetone extract of the twigs of Shoreaacuminata (Dipterocarpaceae), together with
four resveratrol oligomers namely (-)-laevifonol , (-)-α-viniferin , (+)-vaticanol B  and (-)-hopeaphenol. The structure
of these compounds were established based on spectroscopic evidence, including UV, IR, NMR and mass spectra. Compound 1
showed the potent ability to protect β-carotene bleaching by linoleic acid and also to scavenge DPPH radicals with IC50s 0.18
and 6.58 mM respectively. The presence of compound 1 and the other four resveratrol oligomers in this species have great
chemotaxonomic significance on the relationship between Shoreaand other genera of Dipterocarpaceae especially Hopea.