All

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 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.211 Biogenic Amines D001679 +
    D02.092.211.215 Biogenic Monoamines D015306 +
     D02.092.211.215.501 Histamine D006632 +
      D02.092.211.215.501.621 Methylhistamines D008761 
 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.471 Ethylamines D005021 +
    D02.092.471.440 Histamine D006632 +
     D02.092.471.440.500 Methylhistamines D008761 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.374 Imidazoles D007093 +
    D03.383.374.373 Histamine D006632 +
     D03.383.374.373.500 Methylhistamines D008761