All

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 D02 Organic Chemicals D009930 +
  D02.626 Nitriles D009570 +
   D02.626.745 Pregnenolone Carbonitrile D011285 
 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.745 Pregnanes D011278 +
    D04.808.745.745 Pregnenes D011283 +
     D04.808.745.745.725 Pregnenolone D011284 +
      D04.808.745.745.725.703 Pregnenolone Carbonitrile D011285