Stilbenoids are secondary products of heartwood formation in trees that can act as phytoalexins. Chemically they're hydroxylated derivatives of stilbene. Biochemically they belong to the family of phenylpropanoids and share most of their biosynthesis pathway with chalcones. An alternative bacterial stilbenoid ketosynthase-directed pathway exists in bacterial symbionts of nematodes. An example of stilbenoids's resveratrol which's found in grapes and which has been suggested to have many health b… (More on Stilbenoid)