text: *Nucleobase analogues
  **Fluorouracil (5FU), which inhibits thymidylate synthase
  **Floxuridine (FUDR)
  **6-azauracil (6-AU)
  *Nucleoside analogues
  **Cytarabine (Cytosine arabinoside)
  **Gemcitabine 
  *Nucleotide analogues