All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.849 Terpenes D013729 +
    D02.455.849.919 Triterpenes D014315 +
     D02.455.849.919.570 Quassins D036702 +
      D02.455.849.919.570.500 Glaucarubin D005900 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.663 Pyrans D011714 +
    D03.383.663.363 Glaucarubin D005900