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 +
     D02.092.211.215.801 Tryptamines D014363 +
      D02.092.211.215.801.852 Serotonin D012701 +
       D02.092.211.215.801.852.611 5-Methoxytryptamine D008735 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.473 Indoles D007211 +
    D03.438.473.914 Tryptamines D014363 +
     D03.438.473.914.814 Serotonin D012701 +
      D03.438.473.914.814.400 5-Methoxytryptamine D008735