All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.526 Hydrocarbons, Halogenated D006846 +
    D02.455.526.728 Mustard Compounds D009150 +
     D02.455.526.728.650 Nitrogen Mustard Compounds D009588 +
      D02.455.526.728.650.275 Estramustine D004961 
 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.365 Estranes D004962 +
    D04.808.365.415 Estrenes D004963 +
     D04.808.365.415.248 Estradiol D004958 +
      D04.808.365.415.248.320 Estramustine D004961