All

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 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.150 Benzopyrans D001578 +
    D03.438.150.266 Chromones D002867 +
     D03.438.150.266.450 Flavonoids D005419 +
      D03.438.150.266.450.284 Flavonols D044948 +
       D03.438.150.266.450.284.777 Quercetin D011794