All

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 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.570 Hydroxylamines D006898 +
    D02.092.570.450 4-Hydroxyaminoquinoline-1-oxide D015108 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.810 Quinolines D011804 +
    D03.438.810.050 Aminoquinolines D000634 +
     D03.438.810.050.440 4-Hydroxyaminoquinoline-1-oxide D015108 
 D03 Heterocyclic Compounds D006571 +
  D03.661 Heterocyclic Oxides D006577 +
   D03.661.243 Cyclic N-Oxides D003497 +
    D03.661.243.320 4-Hydroxyaminoquinoline-1-oxide D015108