euxanthone
{{Chembox
| Name = Euxanthone
| ImageFile = Euxanthone Structure.svg
| PIN = 1,7-Dihydroxy-9H-xanthen-9-one
| OtherNames = {{Unbulleted list|1,7-Dihydroxyxanthone|Eyxanthone|Purrenone}}
| Section1 = {{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 4444950
| PubChem = 5281631
| CASNo = 529-61-3
| ChEMBL = 389166
| ChEBI = 4946
| KEGG = C10061
| 3DMet = B03583
| Beilstein = 207044
| InChI = 1S/C13H8O4/c14-7-4-5-10-8(6-7)13(16)12-9(15)2-1-3-11(12)17-10/h1-6,14-15H
| InChIKey = KDXFPEKLLFWHMN-UHFFFAOYSA-N
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/C13H8O4/c14-7-4-5-10-8(6-7)13(16)12-9(15)2-1-3-11(12)17-10/h1-6,14-15H
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = KDXFPEKLLFWHMN-UHFFFAOYSA-N
| SMILES = c1cc(c2c(c1)oc3ccc(cc3c2=O)O)O
}}
| Section2 = {{Chembox Properties
| C=13|H=8|O=4
| MeltingPtC =240
}}
| Section3 =
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| Section5 =
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Euxanthone is a naturally occurring xanthonoid, an organic compound with the molecular formula C13H8O4. It can be synthesized from gentisic acid, β-resorcylic acid, and acetic anhydride.{{Cite book|chapter-url=https://www.nga.gov/research/publications/pdf-library/artists-pigments-vol-1.html|title=Artists' pigments : a handbook of their history and characteristics|last=Baer|display-authors=etal|first=N.S.|publisher=National Gallery of Art|location=Washington|pages=25 Fig. 4D Synthesis of euxanthone|chapter=Indian Yellow}} It occurs naturally in many plant species. Commercial production is from purified root extract of Polygala tenuifolia.{{Cite web|url=http://www.chemfaces.com/direct/Polygala-tenuifolia-Willd-20090.html|title=Polygala tenuifolia Willd. -- ChemFaces|website=www.chemfaces.com|access-date=2018-07-11}} It has been investigated for bioactive properties.{{Cite journal|last1=Naidu|first1=M.|last2=Kuan|first2=C.-Y.K.|last3=Lo|first3=W.-L.|last4=Raza|first4=M.|last5=Tolkovsky|first5=A.|last6=Mak|first6=N.-K.|last7=Wong|first7=R.N.-S.|last8=Keynes|first8=R.|date=2007|title=Analysis of the action of euxanthone, a plant-derived compound that stimulates neurite outgrowth|journal=Neuroscience|volume=148|issue=4|pages=915–924|doi=10.1016/j.neuroscience.2007.07.037|pmid=17825492|s2cid=6447850|issn=0306-4522}}{{Cite journal|last1=Câmara|first1=D.V.|last2=Lemos|first2=V.S.|last3=Santos|first3=M.H.|last4=Nagem|first4=T.J.|last5=Cortes|first5=S.F.|date=2010|title=Mechanism of the vasodilator effect of Euxanthone in rat small mesenteric arteries|journal=Phytomedicine|volume=17|issue=8–9|pages=690–692|doi=10.1016/j.phymed.2009.12.003|pmid=20097048|issn=0944-7113|doi-access=free}}