Combretol is an O-methylated flavonol, a type of flavonoid. It is the 3,7,3',4',5'-O-methylation of

myricetin Myricetin is a member of the flavonoid class of polyphenolic compounds, with antioxidant properties. Common dietary sources include vegetables (including tomatoes), fruits (including oranges), nuts, berries, tea, and red wine. Myricetin is structu ...

and can be extracted from ''

Combretum quadrangulare ''Combretum quadrangulare'' is a small tree of the family Combretaceae, up to 10 m high. The tree grows wildly or is planted in Vietnam, Cambodia, Laos, Myanmar and Thailand. The tree is planted along the banks of rivers or arroyos for firing. ...

'' and from ''

Rhodomyrtus tomentosa ''Rhodomyrtus tomentosa'' also known as rose myrtle, is a flowering plant in the family Myrtaceae, native to southern and southeastern Asia, from India, east to southern China, Hong Kong, Taiwan and the Philippines, and south to Malaysia and S ...

''.5-Hydroxy-3,3',4',5',7-pentamethoxyflavone (combretol). Dachriyanus, R. Fahmi, M. V. Sargent, B. W. Skelton and A. H. White, Acta Crystallogr. (2004). E60, o86-o88
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References

O-methylated flavonols Methoxy compounds {{aromatic-stub