Isorhapontin is a stilbenoid. It is the glucoside of isorhapontigenin. It can be found in mycorrhizal and non-mycorrhizal roots of Norway spruces (Picea abies), in the bark of Picea sitchensisStilbene glucosides in the bark of Picea sitchensis. Masakazu Aritomi, Dervilla M.X. Donnelly, Phytochemistry, Volume 15, Issue 12, 1976, Pages 2006–2008, Astringin and isorhapontin distribution in Sitka spruce trees. Claudia D. Toscano Underwood and Raymond B. Pearce, Phytochemistry, Volume 30, Issue 7, 1991, Pages 2183–2189, or in white spruce (Picea glauca).
References