All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.849 Terpenes D013729 +
    D02.455.849.919 Triterpenes D014315 +
     D02.455.849.919.650 Sapogenins D012502 +
       D02.455.849.919.650.600 Oleanolic Acid D009828 
 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.854 Spirostans D013150 +
    D04.808.854.700 Sapogenins D012502 +
      D04.808.854.700.275 Diosgenin D004144