NCIt definition : A nucleoside analog. Pyrazofurin potently inhibits orotidine 5'-monophosphate (OMP)
decarboxylase, thereby interfering with de novo synthesis of uridine nucleotides and
resulting in cytotoxicity. This agent also causes a rapid depletion of the pyrimidine
deoxynucleotide pool, thereby inhibiting DNA synthesis and cell replication. (NCI04);