xerocomorubin

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| ImageFile =Xerocomorubin.svg

| ImageSize = 200px

| Name=Xerocomorubin

| IUPACName=5,6-Dihydroxy-3-[3-hydroxy-4-(4-hydroxyphenyl)-5-oxo-2(5H)-furanylidene]-2(3H)-benzofuranone

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|Section1={{Chembox Identifiers

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| CASNo= 50422-97-4

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| SMILES = c1cc(O)ccc1C(=C(O)2)C(=O)OC2=C3C(=O)OC4=C3C=C(O)C(O)=C4

| StdInChI=1S/C18H10O8/c19-8-3-1-7(2-4-8)13-15(22)16(26-17(13)23)14-9-5-10(20)11(21)6-12(9)25-18(14)24/h1-6,19-22H/b16-14+

| StdInChIKey=KSBHFBKGAVZFRD-JQIJEIRASA-N

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|Section2={{Chembox Properties

| C=18 | H=10 | O=8

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|Section3={{Chembox Hazards

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Xerocomorubin is a pigment from the fungus order Boletales. It is the oxidized form of isoxerocomic acid.{{cite book | author = Gill, M., and Steglich, W. | chapter = Pigments of Fungi (Macromycetes) | date = 1987 | title = Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products | journal = Prog Chem Org Nat Prod | volume = 51 | pages = 1–317 | doi = 10.1007/978-3-7091-6971-1_1 | pmid = 3315906 | isbn = 978-3-7091-7456-2 }} Air oxidation is responsible its formation, and it oxidizes faster to a similar pulvinic acid type pigment oxidized variant, variegatorubin.{{cite journal | author = Edwards and Gill | date = 1973 | title = Constituents of the Higher Fungi. Part X1l.l Identification of lnvolutin as (-)-cis-5-(3,4-Dihydroxyphenyl)-3,4-dihydroxy-2-(4-hydroxyphenyl)-cyclopent-2-enone and Synthesis of (+)-cis-lnvolutin Trimethyl Ether from Isoxerocomic Acid Derivatives }} The long wavelength has an absorption at 497 nm, 106 nm higher than its precursor isoxerocomic acid. Synthesis experiments have shown tetra-acetylation by acetic anhydride and sulfuric acid. Although xerocomorubin and variegatorubin give off the same deep red color and could simultaneously occur in a mushroom, extracts from the deep red colored mushroom Boletus rubellus Krombh. identified only variegatorubin by thin layer chromatography (TLC), leading to the question the natural abundance of xerocomorubin.