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 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.365 Estranes D004962 +
    D04.808.365.415 Estrenes D004963 +
     D04.808.365.415.331 Estriol D004964 +
      D04.808.365.415.331.320 Estetrol D004953 

 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 +
     D06.472.334.851.437 Estradiol Congeners D045166 +
      D06.472.334.851.437.750 Estriol D004964 +
       D06.472.334.851.437.750.320 Estetrol D004953