Stilbenoids are hydroxylated derivatives of stilbene. They have a C 6–C 2–C 6 structure. In biochemical terms, they belong to the family of phenylpropanoids and share most of their biosynthesis pathway with chalcones. Stilbenoids can be produced by plants and bacteria.
hydroxylated derivatives of stilbene and have a C 6–C 2–C 6 structure. They belong to the family of phenylpropanoids and share most of their biosynthesis pathway with chalcones. Under UV irradiation, stilbene and its derivatives undergo intramolecular cyclization, called  Stilbene photocyclization to form dihydrophenanthrenes. Oligomeric forms are known as oligostilbenoids.
Astringin in the bark of Norway spruce Piceid is a resveratrol derivative in grape juices
Stilbenoids are produced in various plants, for example they are secondary products of
heartwood formation in trees that can act as phytoalexins. Another example is resveratrol, an antifungal which is found in grapes and which has been suggested to have health benefits.  Ampelopsin A and Ampelopsin B are resveratrol dimers produced in porcelain berry.
A bacterial stilbenoid,
(, is produced by E)-3,5-dihydroxy-4-isopropyl- trans-stilbene which is a bacterial symbiont of insect nematodes called Photorhabdus . Heterorhabditis
secondary metabolites present in Cannabis sativa.
Phytoalexins have been suggested by some studies to be responsible for resistance to some tree diseases, such as
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