All

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 D02 Organic Chemicals D009930 +
  D02.755 Phenols D010636 +
   D02.755.166 Catechols D002396 +
    D02.755.166.350 Estrogens, Catechol D002393 +
      D02.755.166.350.350 Hydroxyestrones D006894 
 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 +
      D06.472.334.851.437.984 Estrogens, Catechol D002393 +
        D06.472.334.851.437.984.350 Hydroxyestrones D006894