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 +
       D02.455.326.271.884.533.660 Polyvinylpyridine N-Oxide D011144 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.725 Pyridines D011725 +
    D03.383.725.740 Polyvinylpyridine N-Oxide D011144