1 Chengdu Institute of Biology, The Chinese Academy of Sciences, Chengdu 610041, People's Republic of China, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People's Republic of China.
A novel tetrastilbenoid, flexuosol A (1), was isolated from the stems of Vitis flexuosa together with the known gnetin A, (+)-epsilon-viniferin, vitisin A, and hopeaphenol. The structure of 1 was elucidated using spectral methods.