6-O-Methyl Guanosine inhibit colony-forming ability in a malignant xeroderma pigmentosum cell line.

Cytidine (Cytosine-1-β-D-ribofuranoside) is a pyrimidine nucleoside comprised of a cytosine bound to ribose via a beta-N1-glycosidic bond. Cytidine is a precursor for uridine. Both cytidine and uridine are utilized in RNA synthesis.

Capecitabine (Capecitibine) is a fluoropyrimidine carbamate belonging to the class of antineoplastic agents called antimetabolites. As a prodrug, capecitabine is selectively activated by tumor cells to its cytotoxic moiety, 5-fluorouracil (5-FU); subsequently, 5-FU is metabolized to two active metabolites, 5-fluoro-2-deoxyuridine monophosphate (FdUMP) and 5-fluorouridine triphosphate (FUTP) by both tumor cells and normal cells. FdUMP inhibits DNA synthesis and cell division by reducing normal thymidine production, while FUTP inhibits RNA and protein synthesis by competing with uridine triphosphate for incorporation into the RNA strand.

2'-O-(2-azidoethyl)adenosine is a purine nucleoside analog with potential antitumor activity. The activity of 2'-O-(2-azidoethyl)adenosine was associated with inhibition of DNA synthesis and apoptosis.

1-Methylinosine (N1-Methylinosine) is a modified nucleotide found at position 37 in tRNA 3' to the anticodon of eukaryotic tRNA and has a role as a metabolite.