UMP + phosphate <=> alpha-D-ribose 1,5-bisphosphate + uracil
ump + phosphate <=> alpha-d-ribose 1,5-bisphosphate + uracil
UMP + phosphate <=> alpha-D-ribose 1,5-bisphosphate + uracil
ump + phosphate <=> alpha-d-ribose 1,5-bisphosphate + uracil