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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 +
      D02.241.081.251.944.750 Polyurethanes D011140 

 D25 Biomedical and Dental Materials D001697 +
  D25.720 Polymers D011108 +
   D25.720.327 Elastomers D020724 +
    D25.720.327.782 Polyurethanes D011140 

 D25 Biomedical and Dental Materials D001697 +
  D25.720 Polymers D011108 +
   D25.720.716 Plastics D010969 +
    D25.720.716.650 Polyurethanes D011140 

 J01 Technology, Industry, and Agriculture D013676 +
  J01.637 Manufactured Materials D008420 +
   J01.637.412 Elastomers D020724 +
    J01.637.412.700 Polyurethanes D011140