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 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.311 Catecholamines D002395 +
    D02.092.311.200 Dihydroxyphenylalanine D004295 +
     D02.092.311.200.538 Methyldopa D008750 
       D02.092.311.200.538.200 Carbidopa D002230 

 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 +
      D12.125.072.050.685.400 Dihydroxyphenylalanine D004295 +
       D12.125.072.050.685.400.600 Methyldopa D008750