RESVERATROL DIMERS FROM STEM BARK OF Hopea gregaria AND THEIR CYTOTOXIC PROPERTIES

Six resveratrol dimers have been isolated from the stem bark of H. gregaria, ampelopsin A (1), balanocarpol (2), e-viniferin (3), hopeafuran (4), heimiol A (5), and parviflorol (6). The structures of these compounds were determined based on spectroscopic evidence such as UV, IR, 1-D, 2-D NMR and comparison with the reported data. This compound inventions are strengthen conclusion that Hopea tends to produce resveratrol dimers. Biological activity of those compounds against murine leukemia P-388 cells showed that e-viniferin (3) is the most active compound with IC50 value 5.1 ± 0.3 μg/mL.