How is rotenone a polyphenol?

How is it a polyphenol if it doesn't have a hydroxyl group?


If it isn't which subclass would you put it in, and which functional groups does it contain? 





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> How is rotenone a polyphenol?
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**It is not.** Wikipedia says: *Polyphenols are $\ldots$ characterized by the presence of large multiples of phenol structural units.*


And if you're to pull up an image which gives you the structural formula of rotenone you get (Image source: [https://upload.wikimedia.org/wikipedi...](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Rotenone_Structural_Formula_V.1.svg/1200px-Rotenone_Structural_Formula_V.1.svg.png))


[![rotenone](https://i.stack.imgur.com/aEVn8.png)](https://i.stack.imgur.com/aEVn8.png)


Do you see any phenols in this structure?



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> If it isn't which subclass would you put it in
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According to this article I've found:



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> [Article source](http://www.newmexicotu.org/Rotenone%20summary.pdf)
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> > In the late $1920$’s, the chemical structure of rotenone was determined. Rotenone is a member of a class of compounds of related molecular structure referred to as isoflavones.
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And finally,



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> which functional groups does it contain?
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With a keen eye, if you look at the structure carefully, you'll at least be able to spot a ketone.


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It [looks like ChEBI](https://www.ebi.ac.uk/chebi/chebiOntology.do?chebiId=CHEBI:28201) classifies it as [an isoflavone](https://en.wikipedia.org/wiki/Isoflavones) which are ketone-containing hetro ring systems with an oxygen.


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