All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.742 Pyrimidines D011743 +
    D03.383.742.698 Pyrimidinones D011744 +
     D03.383.742.698.253 Barbiturates D001463 +
      D03.383.742.698.253.800 Thiobarbiturates D013858 +
       D03.383.742.698.253.800.750 Thiamylal D013840