Ombuin

Ombuin is an O-methylated flavonol, a type of flavonoid. It is the 4',7-O-methyl derivative of quercetin.

Ombuin

Chemical structure of ombuin
Names
IUPAC name 3,3′,5-Trihydroxy-4′,7-dimethoxyflavone
Systematic IUPAC name 3,5-Dihydroxy-2-(3-hydroxy-4-methoxyphenyl)-7-methoxy-4H-1-benzopyran-4-one
Other names 4′,7-Dimethylquercetin 7,4′-Di-O-methylquercetin 4′,7-Dimethoxy-3,3′,5-trihydroxyflavone
Identifiers
CAS Number	529-40-8 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:67493 N
ChemSpider	4478412 N
PubChem CID	5320287
UNII	Z3K3F0YR3W Y
CompTox Dashboard (EPA)	DTXSID00200942
InChI InChI=1S/C17H14O7/c1-22-9-6-11(19)14-13(7-9)24-17(16(21)15(14)20)8-3-4-12(23-2)10(18)5-8/h3-7,18-19,21H,1-2H3 N Key: BWORNNDZQGOKBY-UHFFFAOYSA-N N InChI=1/C17H14O7/c1-22-9-6-11(19)14-13(7-9)24-17(16(21)15(14)20)8-3-4-12(23-2)10(18)5-8/h3-7,18-19,21H,1-2H3 Key: BWORNNDZQGOKBY-UHFFFAOYAW
SMILES COC1=C(C=C(C=C1)C2=C(C(=O)C3=C(C=C(C=C3O2)OC)O)O)O
Properties
Chemical formula	C17H14O7
Molar mass	330.29 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Ombuin can be found in species of the genus Erythroxylum. It can also be synthesized.^[1] Ombuin 3-sulfate can be isolated from Flaveria chlorifolia.^[2]

Glycosides

Ombuin-3-rutinoside can be isolated from Phytolacca dioica, the ombu tree.^[3] Ombuin-3-O-rhamnosylglucoside can be found in Erythroxylum rufum.^[4]
Other glycosides (ombuosides) :

• Ombuin 3-galactoside (C₂₃H₂₄O₁₂, CAS number 69168-13-4)
• Ombuin 3-glucoside (C₂₃H₂₄O₁₂, CAS number 158642-42-3)