Isorhapontigenin is a tetrahydroxylated

stilbenoid Stilbenoids are hydroxylated derivatives of stilbene. They have a C6–C2–C6 structure. In biochemical terms, they belong to the family of phenylpropanoids and share most of their biosynthesis pathway with chalcones. Most stilbenoids are prod ...

with a methoxy group. It is an isomer of

rhapontigenin Rhapontigenin is a stilbenoid. It can be isolated from ''Vitis coignetiae'' or from '' Gnetum cleistostachyum''. It shows an action on prostate cancer cells. It has been shown to inhibit the human cytochrome P450 1A1, an enzyme implicated in the ...

and an analog of resveratrol. It is found in the Chinese herb ''

Gnetum cleistostachyum ''Gnetum cleistostachyum'' is a liana species in the ''Sessiles'' subsection of the genus ''Gnetum'' described from South East Yunnan. The name is still invalid and efloras states it is advisable to postpone validating it until more complete c ...

'', in ''

Gnetum parvifolium ''Gnetum'' is a genus of gymnosperms, the sole genus in the family Gnetaceae within the Gnetophyta. They are tropical evergreen trees, shrubs and lianas. Unlike other gymnosperms, they possess vessel elements in the xylem. Some species have been ...

'' and in the seeds of the palm ''

Aiphanes aculeata ''Aiphanes horrida'' is a palm native to northern South America and Trinidad and Tobago. ''Aiphanes horrida'' is a solitary, spiny tree. In the wild it grows 3–10 metres tall (9–30 feet) tall with a stem diameter of 6–10 centimetres (2� ...

''. An isorhapontigenin tetramer, gnetuhainin R, can be isolated from the lianas of '' Gnetum hainanense''. Isorhapontin, the isorhapontigenin glucoside, can be found in spruce species such as the Norway spruce (''

Picea abies ''Picea abies'', the Norway spruce or European spruce, is a species of spruce native to Northern, Central and Eastern Europe. It has branchlets that typically hang downwards, and the largest cones of any spruce, 9–17 cm long. It is very close ...

''), the sitka spruce (''

Picea sitchensis ''Picea sitchensis'', the Sitka spruce, is a large, coniferous, evergreen tree growing to almost tall, with a trunk diameter at breast height that can exceed 5 m (16 ft). It is by far the largest species of spruce and the fifth-larg ...

'') and the white spruce (''

Picea glauca ''Picea glauca'', the white spruce, is a species of spruce native to the northern temperate and boreal forests in North America. ''Picea glauca'' is native from central Alaska all through the east, across southern/central Canada to the Avalon Pe ...

'').

References

Stilbenoids {{aromatic-stub