All

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 D02 Organic Chemicals D009930 +
  D02.886 Sulfur Compounds D013457 +
   D02.886.489 Sulfhydryl Compounds D013438 +
    D02.886.489.534 6-Mercaptopurine D015122 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.759 Purines D011687 +
    D03.438.759.534 6-Mercaptopurine D015122 
      D03.438.759.534.090 Azathioprine D001379