All

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 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.081 Acids, Acyclic D000144 +
    D02.241.081.251 Carbamates D002219 +
     D02.241.081.251.944 Urethane D014520 +
       D02.241.081.251.944.500 Nitrosomethylurethane D009605 
       D02.241.081.251.944.750 Polyurethanes D011140