All

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 D04 Polycyclic Hydrocarbons D011083 +
  D04.615 Polycyclic Hydrocarbons, Aromatic D011084 +
   D04.615.389 Fluorenes D005449 +
     D04.615.389.850 Tilorone D013994 
     D04.615.389.050 2-Acetylaminofluorene D015073 +