All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.326 Hydrocarbons, Acyclic D006839 +
    D02.455.326.271 Alkenes D000475 +
     D02.455.326.271.884 Vinyl Compounds D014753 +
      D02.455.326.271.884.533 Polyvinyls D011145 +
       D02.455.326.271.884.533.710 Povidone-Iodine D011206 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.773 Pyrrolidines D011759 +
    D03.383.773.812 Pyrrolidinones D011760 +
     D03.383.773.812.615 Povidone D011205 +
      D03.383.773.812.615.630 Povidone-Iodine D011206 
 D25 Biomedical and Dental Materials D001697 +
  D25.720 Polymers D011108 +
   D25.720.716 Plastics D010969 +
    D25.720.716.721 Polyvinyls D011145 +
     D25.720.716.721.838 Povidone D011205 +
      D25.720.716.721.838.745 Povidone-Iodine D011206