All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.326 Hydrocarbons, Acyclic D006839 +
    D02.455.326.146 Alkanes D000473 +
      D02.455.326.146.216 Butanes D002073 
      D02.455.326.146.379 Ethane D004980 +
      D02.455.326.146.485 Heptanes D006536 +
      D02.455.326.146.500 Hexanes D006586 
      D02.455.326.146.571 Methane D008697 +
      D02.455.326.146.672 Nitroparaffins D009595 +
      D02.455.326.146.720 Octanes D009795 
      D02.455.326.146.770 Pentanes D010420 
      D02.455.326.146.800 Propane D011407 
      D02.455.326.146.100 Alkanesulfonic Acids D017738 +
      D02.455.326.146.432 Fumonisins D037341