All

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 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 +
      D04.808.745.745.725.395 17-alpha-Hydroxypregnenolone D006907 
 D06 Hormones, Hormone Substitutes, and Hormone Antagonists D006730 +
  D06.472 Hormones D006728 +
   D06.472.040 Adrenal Cortex Hormones D000305 +
    D06.472.040.585 Hydroxycorticosteroids D006889 +
     D06.472.040.585.745 Pregnenolone D011284 +
      D06.472.040.585.745.500 17-alpha-Hydroxypregnenolone D006907 
 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 +
      D06.472.334.851.687.500 Pregnenolone D011284 +
       D06.472.334.851.687.500.500 17-alpha-Hydroxypregnenolone D006907