All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.097 Azirines D001389 +
    D03.383.097.217 Aziridines D001388 +
      D03.383.097.217.300 Carbazilquinone D002225 
      D03.383.097.217.935 Triethylenephosphoramide D013721 +
      D03.383.097.217.900 Triaziquone D014228 
      D03.383.097.217.924 Triethylenemelamine D014265