Isorhapontigenin

Isorhapontigenin is a tetrahydroxylated stilbenoid with a methoxy group. It is an isomer of rhapontigenin and an analog of resveratrol.^[1] It is found in the Chinese herb Gnetum cleistostachyum,^[2] in Gnetum parvifolium^[3] and in the seeds of the palm Aiphanes aculeata.^[4]

Isorhapontigenin

Names
Preferred IUPAC name 5-[(E)-2-(4-Hydroxy-3-methoxyphenyl)ethen-1-yl]benzene-1,3-diol
Other names 3,4',5-trihydroxy-3'-methoxystilbene ISO
Identifiers
CAS Number	32507-66-7 20767-15-1 (non-specific) Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:167830
ChemSpider	4477172
ECHA InfoCard	100.230.279
PubChem CID	5318650
UNII	CZ49V3K5HS Y
CompTox Dashboard (EPA)	DTXSID601045304
InChI InChI=1S/C15H14O4/c1-19-15-8-10(4-5-14(15)18)2-3-11-6-12(16)9-13(17)7-11/h2-9,16-18H,1H3/b3-2+ Key: ANNNBEZJTNCXHY-NSCUHMNNSA-N InChI=1/C15H14O4/c1-19-15-8-10(4-5-14(15)18)2-3-11-6-12(16)9-13(17)7-11/h2-9,16-18H,1H3/b3-2+ Key: ANNNBEZJTNCXHY-NSCUHMNNBY
SMILES COC1=C(C=CC(=C1)C=CC2=CC(=CC(=C2)O)O)O
Properties
Chemical formula	C15H14O4
Molar mass	258.27 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

An isorhapontigenin tetramer, gnetuhainin R, can be isolated from the lianas of Gnetum hainanense.^[5]

Isorhapontin, the isorhapontigenin glucoside, can be found in spruce species such as the Norway spruce (Picea abies), the sitka spruce (Picea sitchensis) and the white spruce (Picea glauca).^[6]