All

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 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.745 Pregnanes D011278 +
    D04.808.745.432 Pregnadienes D011245 +
     D04.808.745.432.769 Pregnadienetriols D011246 +
      D04.808.745.432.769.344 Dexamethasone D003907 +
       D04.808.745.432.769.344.300 Dexamethasone Isonicotinate D003908 
 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.908 Steroids, Fluorinated D013259 +
    D04.808.908.238 Dexamethasone D003907 +
     D04.808.908.238.300 Dexamethasone Isonicotinate D003908