All

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 D02 Organic Chemicals D009930 +
  D02.654 Nitroso Compounds D009603 +
   D02.654.692 Nitrosourea Compounds D009607 +
    D02.654.692.300 Ethylnitrosourea D005038 
 D02 Organic Chemicals D009930 +
  D02.948 Urea D014508 +
   D02.948.594 Nitrosourea Compounds D009607 +
    D02.948.594.310 Ethylnitrosourea D005038