(1) pyrimidine ribonucleoside 5'-diphosphate - NME* -> pyrimidine ribonucleoside 5'-triphosphate
(2) UDP -> pyrimidine ribonucleoside 5'-diphosphate
(3) pyrimidine ribonucleoside 5'-diphosphate+TXN - Fe_super_2+_endsuper_:RRM1:RRM2* -> pyrimidine 2'-deoxyribonucleoside 5'-diphosphate+TXN