All

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 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.102 Ammonium Compounds D000644 +
    D02.092.102.232 Choline D002794 +
     D02.092.102.232.720 Propylbenzilylcholine Mustard D011438 
 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.526 Hydrocarbons, Halogenated D006846 +
    D02.455.526.728 Mustard Compounds D009150 +
     D02.455.526.728.650 Nitrogen Mustard Compounds D009588 +
      D02.455.526.728.650.740 Propylbenzilylcholine Mustard D011438 
 D02 Organic Chemicals D009930 +
  D02.675 Onium Compounds D009861 +
   D02.675.276 Ammonium Compounds D000644 +
    D02.675.276.232 Choline D002794 +
     D02.675.276.232.720 Propylbenzilylcholine Mustard D011438