L-erythrulose + D-erythrose 4-phosphate <=> glycolaldehyde + beta-D-fructose 6-phosphate
l-erythrulose + d-erythrose 4-phosphate <=> glycolaldehyde + beta-d-fructose 6-phosphate
L-erythrulose + D-erythrose 4-phosphate <=> glycolaldehyde + beta-D-fructose 6-phosphate
l-erythrulose + d-erythrose 4-phosphate <=> glycolaldehyde + beta-d-fructose 6-phosphate