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 +
      D02.455.526.728.650.156 Chlorambucil D002699 +
       D02.455.526.728.650.156.700 Prednimustine D011238 
 D04 Polycyclic Hydrocarbons D011083 +
  D04.808 Steroids D013256 +
   D04.808.745 Pregnanes D011278 +
    D04.808.745.432 Pregnadienes D011245 +
     D04.808.745.432.769 Pregnadienetriols D011246 +
      D04.808.745.432.769.795 Prednisolone D011239 +
       D04.808.745.432.769.795.700 Prednimustine D011238