All

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 D13 Nucleic Acids, Nucleotides, and Nucleosides D009706 +
  D13.570 Nucleosides D009705 +
   D13.570.230 Deoxyribonucleosides D003853 +
    D13.570.230.855 Thymidine D013936 +
     D13.570.230.855.900 Trifluridine D014271 
 D13 Nucleic Acids, Nucleotides, and Nucleosides D009706 +
  D13.570 Nucleosides D009705 +
   D13.570.685 Pyrimidine Nucleosides D011741 +
    D13.570.685.705 Thymidine D013936 +
     D13.570.685.705.900 Trifluridine D014271