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 +
      D02.455.526.728.650.730 Phosphoramide Mustards D010752 +
        D02.455.526.728.650.730.243 Cyclophosphamide D003520 +
 D02 Organic Chemicals D009930 +
  D02.705 Organophosphorus Compounds D009943 +
   D02.705.670 Phosphoramide Mustards D010752 +
     D02.705.670.243 Cyclophosphamide D003520 +