All

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 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.745 Pregnanes D011278 +
    D04.808.745.558 Pregnanediones D011277 +
     D04.808.745.558.783 Tetrahydrocortisone D013761 
 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 +
     D06.472.040.585.478 17-Hydroxycorticosteroids D015065 +
      D06.472.040.585.478.865 Tetrahydrocortisone D013761