All

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 D02 Organic Chemicals D009930 +
  D02.719 Organothiophosphorus Compounds D009946 +
   D02.719.950 Thiotepa D013852 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.097 Azirines D001389 +
    D03.383.097.217 Aziridines D001388 +
     D03.383.097.217.935 Triethylenephosphoramide D013721 +
      D03.383.097.217.935.960 Thiotepa D013852