All

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 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.745 Pregnanes D011278 +
    D04.808.745.558 Pregnanediones D011277 +
      D04.808.745.558.050 Alfaxalone Alfadolone Mixture D000530 
      D04.808.745.558.783 Tetrahydrocortisone D013761 
      D04.808.745.558.024 5-alpha-Dihydroprogesterone D043582