All

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 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.612 Naphthyridines D009287 +
    D03.438.612.500 Nalidixic Acid D009268 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.810 Quinolines D011804 +
    D03.438.810.835 Quinolones D015363 +
     D03.438.810.835.055 4-Quinolones D042462 +
      D03.438.810.835.055.500 Nalidixic Acid D009268