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 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.745 Pregnanes D011278 +
    D04.808.745.558 Pregnanediones D011277 +
     D04.808.745.558.024 5-alpha-Dihydroprogesterone D043582 

 D06 Hormones, Hormone Substitutes, and Hormone Antagonists D006730 +
  D06.472 Hormones D006728 +
   D06.472.334 Gonadal Hormones D042341 +
    D06.472.334.851 Gonadal Steroid Hormones D012739 +
     D06.472.334.851.687 Progesterone Congeners D045167 +
      D06.472.334.851.687.750 Progesterone D011374 +
       D06.472.334.851.687.750.099 5-alpha-Dihydroprogesterone D043582