All

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 D02 Organic Chemicals D009930 +
  D02.065 Amides D000577 +
   D02.065.589 Lactams D007769 +
    D02.065.589.385 Monobactams D008997 +
     D02.065.589.385.044 Aztreonam D001398 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.411 Lactams D007769 +
    D03.383.411.350 Monobactams D008997 +
     D03.383.411.350.044 Aztreonam D001398