All

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 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.247 Cholestanes D002776 +
    D04.808.247.222 Cholestenes D002782 +
     D04.808.247.222.265 Cholestenones D002783 +
       D04.808.247.222.265.450 Ketocholesterols D007653 
       D04.808.247.222.265.165 Ecdysteroids D026461