[Biotransformation of ftorafur].

Biotransformation of ftorafir (FT) was studied using 2-14C-ftorafur and 2;5'-14C-ftorafur. Both pyrimidine and tetrahydrofurane moieties of the FT underwent degradation to CO2 in rats. The cleavage of the pseudoglycosidic bonds C-N and formation of 5-fluorouracil was one of the steps of the FT metabolism that limited the velocity of the whole… (More)