All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.849 Terpenes D013729 +
    D02.455.849.575 Monoterpenes D039821 +
     D02.455.849.575.781 Norbornanes D009636 +
      D02.455.849.575.781.234 Bornanes D001892 +
       D02.455.849.575.781.234.326 Camphor D002164 
 D02 Organic Chemicals D009930 +
  D02.522 Ketones D007659 +
   D02.522.376 Camphor D002164