All

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 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.782 Polyamines D011073 +
    D02.092.782.258 Diamines D003959 +
     D02.092.782.258.368 Ethylenediamines D005029 +
      D02.092.782.258.368.050 Aminophylline D000628 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.759 Purines D011687 +
    D03.438.759.758 Purinones D011688 +
     D03.438.759.758.824 Xanthines D014970 +
      D03.438.759.758.824.751 Theophylline D013806 +
       D03.438.759.758.824.751.075 Aminophylline D000628