3,4′-Dihydroxystilbene is a stilbenoid found in the roots of Hydrangea macrophylla.Lunularic acid and related compounds in liverworts, algae and Hydrangea. John Gorham, Phytochemistry, 1977, Volume 16, Issue 2, Pages 249–253,

See also 4,4'-Dihydroxystilbene Resveratrol

References