D-ribose 5-phosphate + phosphate => D-ribose 2,5-bisphosphate + H2O
d-ribose 5-phosphate + phosphate => d-ribose 2,5-bisphosphate + h2o
D-ribose 5-phosphate + phosphate => D-ribose 2,5-bisphosphate + H2O
d-ribose 5-phosphate + phosphate => d-ribose 2,5-bisphosphate + h2o