All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.426 Hydrocarbons, Cyclic D006844 +
    D02.455.426.559 Hydrocarbons, Aromatic D006841 +
     D02.455.426.559.389 Benzene Derivatives D001555 +
      D02.455.426.559.389.140 Benzyl Compounds D001593 +
       D02.455.426.559.389.140.450 Lignans D017705 +
        D02.455.426.559.389.140.450.388 Flavonolignans D044947 
 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 +
      D03.438.150.266.450.268 Flavonolignans D044947 
        D03.438.150.266.450.268.777 Silymarin D012838