Methotrexate (WR19039) is a folate analog, an inhibitor of the dihydrofolate reductase DHFR. Methotrexate has antimetabolic, antitumor, and immunosuppressive activities, and is commonly used in rheumatoid arthritis and various tumors.

T7 RNA polymerase, expressed by Escherichia coli from the T7 bacteriophage RNA polymerase gene, is a highly specific enzyme utilized for in vitro transcription (IVT) of mRNA. This polymerase requires Mg 2+ and selects only DNA templates that contain the T7 promoter sequence, whether single-stranded or double-stranded. It employs NTPs to synthesize RNA that is complementary to the single-stranded DNA following the promoter [1] [2].

T4 RNA ligase is an enzyme that facilitates the ligation of single-stranded DNA. It is utilized for the synthesis of enzymatic oligoribonucleotides and the 3′-terminal labeling of RNA [1] [2].

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.

3-AP (Triapine) is a novel inhibitor of the M2 subunit of ribonucleotide reductase (RR).