Pteroxygonum giraldii
Encyclopedia
Pteroxygonum giraldii is a plant species in the genus Pteroxygonum
Pteroxygonum
Pteroxygonum is a plant genus in the family Polygonaceae....

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Annulatin
Annulatin
Annulatin is an O-methylated flavonol found in the roots of Pteroxygonum giraldii....

 is an O-methylated flavonol
Flavonols
Flavonols are a class of flavonoids that have the 3-hydroxyflavone backbone . Their diversity stems from the different positions the phenolic -OH groups. They are distinct from flavanols , another class of flavonoids.Flavonols are present in a wide variety of fruits and vegetables...

found in the roots of P. giraldii.
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