Stilbene dimers from the lianas of Gnetum hainanense

Abstract Five stilbene dimers, gnetuhainins F–J, were isolated together with gnetulin, rhapontigenin, isorhapontigenin and gnetol from the lianas of Gnetum hainanense C. Y. Cheng. Their structures and stereochemistry have been established on the basis of spectral evidence, especially 2D NMR spectroscopic techniques.