Pyrimidine analogs, such as 5-fluorouracil (5-FU) and gemcitabine, are used as chemotherapeutic agents to treat various types of cancer. These drugs interfere with DNA synthesis and replication, ...

The purine structure consists of a pyrimidine ring (positions 1 to 6 ... also a component of important biomolecules such as GTP (guanosine triphosphate), which is involved in cellular signaling and ...