All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.773 Pyrrolidines D011759 +
    D03.383.773.812 Pyrrolidinones D011760 +
      D03.383.773.812.180 Cotinine D003367 
      D03.383.773.812.226 Doxapram D004315 
      D03.383.773.812.498 Oxotremorine D010095 
      D03.383.773.812.555 Piracetam D010889 
      D03.383.773.812.615 Povidone D011205 
      D03.383.773.812.718 Pyrrolidonecarboxylic Acid D011761 
      D03.383.773.812.852 Succinimides D013388 +
      D03.383.773.812.900 Tenuazonic Acid D013720 
      D03.383.773.812.785 Rolipram D020889