All

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 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.247 Cholestanes D002776 +
    D04.808.247.808 Sterols D013261 +
     D04.808.247.808.756 Phytosterols D010840 +
       D04.808.247.808.756.287 Ergosterol D004875 
       D04.808.247.808.756.669 Sitosterols D012855 
       D04.808.247.808.756.808 Stigmasterol D013265 
       D04.808.247.808.756.143 Ecdysteroids D026461