All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.849 Terpenes D013729 +
    D02.455.849.575 Monoterpenes D039821 +
     D02.455.849.575.500 Iridoids D039823 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.663 Pyrans D011714 +
    D03.383.663.491 Iridoids D039823