obsolete D-ribose 5-phosphate:D-fructose 6-phosphate transaldolase activity (obsolete GO:0102648)
OBSOLETE. Catalysis of the reaction: D-fructose 6-phosphate + D-ribose 5-phosphate = D-glycero-D-altro-octulose 8-phosphate + D-glyceraldehyde 3-phosphate.