All

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 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.223 Acids, Carbocyclic D000146 +
    D02.241.223.805 Phthalic Acids D010795 +
     D02.241.223.805.810 Phthalimides D010797 +
      D02.241.223.805.810.800 Thalidomide D013792 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.621 Piperidines D010880 +
    D03.383.621.808 Piperidones D010881 +
     D03.383.621.808.800 Thalidomide D013792