All

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 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.668 Norsteroids D009654 +
    D04.808.668.651 Norpregnanes D009650 +
     D04.808.668.651.568 Norpregnatrienes D009651 +
      D04.808.668.651.568.291 Ethinyl Estradiol D004997 +
        D04.808.668.651.568.291.500 Mestranol D008656 
        D04.808.668.651.568.291.750 Quinestrol D011800 
        D04.808.668.651.568.291.250 Ethinyl Estradiol-Norgestrel Combination D019304 
 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 +
      D06.472.334.851.437.968 Estrogenic Steroids, Alkylated D042782 +
       D06.472.334.851.437.968.500 Ethinyl Estradiol D004997 +
         D06.472.334.851.437.968.500.500 Mestranol D008656 
         D06.472.334.851.437.968.500.750 Quinestrol D011800 
         D06.472.334.851.437.968.500.250 Ethinyl Estradiol-Norgestrel Combination D019304