All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.326 Hydrocarbons, Acyclic D006839 +
    D02.455.326.271 Alkenes D000475 +
     D02.455.326.271.665 Polyenes D011090 +
      D02.455.326.271.665.806 Squalene D013185 
 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.849 Terpenes D013729 +
    D02.455.849.919 Triterpenes D014315 +
     D02.455.849.919.681 Squalene D013185