All

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 D03 Heterocyclic Compounds D006571 +
  D03.066 Acids, Heterocyclic D000147 +
   D03.066.942 Xanthurenates D014977 +
    D03.066.942.505 Kynurenic Acid D007736 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.810 Quinolines D011804 +
    D03.438.810.350 Hydroxyquinolines D006912 +
     D03.438.810.350.400 Kynurenic Acid D007736