2.4.2.20 dioxotetrahydropyrimidine phosphoribosyltransferase; dioxotetrahydropyrimidine-ribonucleotide pyrophosphorylase; dioxotetrahydropyrimidine phosphoribosyl transferase; dioxotetrahydropyrimidine ribonucleotide pyrophosphorylase; 2,4-dioxotetrahydropyr • • •