All

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 D02 Organic Chemicals D009930 +
  D02.654 Nitroso Compounds D009603 +
   D02.654.692 Nitrosourea Compounds D009607 +
    D02.654.692.768 Streptozocin D013311 
 D02 Organic Chemicals D009930 +
  D02.948 Urea D014508 +
   D02.948.594 Nitrosourea Compounds D009607 +
    D02.948.594.768 Streptozocin D013311 
 D09 Carbohydrates and Hypoglycemic Agents D002242 +
  D09.203 Carbohydrates D002241 +
   D09.203.408 Glycosides D006027 +
    D09.203.408.051 Aminoglycosides D000617 +
     D09.203.408.051.900 Streptozocin D013311