All

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 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 +
      D02.455.526.728.650.594 Melphalan D008558 
        D02.455.526.728.650.594.690 Peptichemio D010440 
 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.125 Amino Acids D000596 +
   D12.125.072 Amino Acids, Cyclic D000598 +
    D12.125.072.050 Amino Acids, Aromatic D024322 +
     D12.125.072.050.685 Phenylalanine D010649 +
      D12.125.072.050.685.500 Melphalan D008558