All

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 D02 Organic Chemicals D009930 +
  D02.715 Organosilicon Compounds D017646 +
   D02.715.650 Siloxanes D012833 +
    D02.715.650.700 Silicones D012828 +
      D02.715.650.700.150 Dimethylpolysiloxanes D004129 +
      D02.715.650.700.800 Silicone Oils D012827 
      D02.715.650.700.755 Silicone Gels D020034 
 D25 Biomedical and Dental Materials D001697 +
  D25.720 Polymers D011108 +
   D25.720.900 Siloxanes D012833 +
    D25.720.900.850 Silicones D012828 +
      D25.720.900.850.150 Dimethylpolysiloxanes D004129 +
      D25.720.900.850.900 Silicone Elastomers D012826 
      D25.720.900.850.950 Silicone Oils D012827 
      D25.720.900.850.905 Silicone Gels D020034