All

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 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.473 Indoles D007211 +
    D03.438.473.914 Tryptamines D014363 +
     D03.438.473.914.201 Dihydroxytryptamines D004102 +
       D03.438.473.914.201.259 5,6-Dihydroxytryptamine D015115 
       D03.438.473.914.201.263 5,7-Dihydroxytryptamine D015116