All

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 D03 Heterocyclic Compounds D006571 +
  D03.066 Acids, Heterocyclic D000147 +
   D03.066.399 Isonipecotic Acids D007540 +
     D03.066.399.300 Diphenoxylate D004157 
     D03.066.399.450 Meperidine D008614 +
     D03.066.399.600 Phenoperidine D010638 
     D03.066.399.650 Pirinitramide D010892 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.621 Piperidines D010880 +
    D03.383.621.349 Isonipecotic Acids D007540 +
      D03.383.621.349.300 Diphenoxylate D004157 
      D03.383.621.349.450 Meperidine D008614 +
      D03.383.621.349.683 Phenoperidine D010638 
      D03.383.621.349.700 Pirinitramide D010892