UMP + diphosphate <=> 5-phospho-alpha-D-ribose 1-diphosphate + uracil
ump + diphosphate <=> 5-phospho-alpha-d-ribose 1-diphosphate + uracil
UMP + diphosphate <=> 5-phospho-alpha-D-ribose 1-diphosphate + uracil
ump + diphosphate <=> 5-phospho-alpha-d-ribose 1-diphosphate + uracil