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 D02 Organic Chemicals D009930 +
  D02.033 Alcohols D000438 +
   D02.033.455 Glycols D006018 +
    D02.033.455.125 Butylene Glycols D002072 +
     D02.033.455.125.125 Busulfan D002066 

 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.326 Hydrocarbons, Acyclic D006839 +
    D02.455.326.146 Alkanes D000473 +
     D02.455.326.146.100 Alkanesulfonic Acids D017738 +
      D02.455.326.146.100.050 Alkanesulfonates D000476 +
       D02.455.326.146.100.050.500 Mesylates D008698 +
        D02.455.326.146.100.050.500.100 Busulfan D002066 

 D02 Organic Chemicals D009930 +
  D02.886 Sulfur Compounds D013457 +
   D02.886.645 Sulfur Acids D013456 +
    D02.886.645.600 Sulfonic Acids D013451 +
     D02.886.645.600.055 Alkanesulfonic Acids D017738 +
      D02.886.645.600.055.050 Alkanesulfonates D000476 +
       D02.886.645.600.055.050.510 Mesylates D008698 +
        D02.886.645.600.055.050.510.100 Busulfan D002066