All

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 D02 Organic Chemicals D009930 +
  D02.033 Alcohols D000438 +
   D02.033.455 Glycols D006018 +
    D02.033.455.250 Ethylene Glycols D005026 +
     D02.033.455.250.700 Polyethylene Glycols D011092 +
      D02.033.455.250.700.485 Hydrogel D020136 
 D25 Biomedical and Dental Materials D001697 +
  D25.720 Polymers D011108 +
   D25.720.741 Polyethylene Glycols D011092 +
    D25.720.741.485 Hydrogel D020136 
 D26 Pharmaceutical Preparations D004364 +
  D26.255 Dosage Forms D004304 +
   D26.255.165 Colloids D003102 +
    D26.255.165.320 Gels D005782 +
     D26.255.165.320.375 Hydrogels D020100 +
      D26.255.165.320.375.375 Hydrogel D020136