All

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 D13 Nucleic Acids, Nucleotides, and Nucleosides D009706 +
  D13.570 Nucleosides D009705 +
   D13.570.230 Deoxyribonucleosides D003853 +
    D13.570.230.500 Dideoxynucleosides D015224 +
      D13.570.230.500.950 Zidovudine D015215 
      D13.570.230.500.925 Zalcitabine D016047 +
      D13.570.230.500.105 Dideoxyadenosine D016048 
      D13.570.230.500.090 Didanosine D016049 
      D13.570.230.500.850 Stavudine D018119