Two new oligostilbenes with dihydrobenzofuran from the stem bark of Vateria indica

Abstract Two new stilbenoids, vateriaphenols A ( 1 ) and B ( 2 ), were isolated from the stem bark of Vateria indica along with known 10 stilbenoids ( 3 – 12 ) and bergenin ( 13 ). The structures of isolates were established based on spectroscopic analysis. The structures of vateriaphenols A and B were characterized as an octamer and a tetramer of resveratrol, respectively. The spectral properties of the highly condensed vateriaphenol A were also discussed.