Biologically active oligostilbenes from the stems of and chemotaxonomic significance.

Phytochemical investigation of the stems of (Dipterocarpaceae) led to the isolation and structural elucidation of twenty-seven oligostilbenes (), including a new natural compound . The structure of was elucidated on the basis of spectroscopic analyses including NMR, MS and ECD data, and the known compounds were identified by comparisons with those reported in the literature. The absolute configuration of was first time determined by a combination of NOESY spectrum and quantum chemical computation. Among of isolates were tested for their anti-osteoporosis and anti-HIV-1 activities by the MTT method. Moreover, the chemotaxonomic significance of these compounds was summarised.