All

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 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.081 Acids, Acyclic D000144 +
    D02.241.081.583 Imino Acids D007098 +
     D02.241.081.583.100 Azetidinecarboxylic Acid D001383 
 D02 Organic Chemicals D009930 +
  D02.491 Imines D007097 +
   D02.491.485 Imino Acids D007098 +
    D02.491.485.100 Azetidinecarboxylic Acid D001383 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.082 Azetines D001385 +
    D03.383.082.301 Azetidines D001384 +
     D03.383.082.301.100 Azetidinecarboxylic Acid D001383 
 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.125 Amino Acids D000596 +
   D12.125.072 Amino Acids, Cyclic D000598 +
    D12.125.072.401 Imino Acids D007098 +
     D12.125.072.401.200 Azetidinecarboxylic Acid D001383