D-glycero-alpha-D-manno-heptose 7-phosphate + D-glycero-beta-D-manno-heptose 7-phosphate => 2 D-sedoheptulose 7-phosphate
d-glycero-alpha-d-manno-heptose 7-phosphate + d-glycero-beta-d-manno-heptose 7-phosphate => 2 d-sedoheptulose 7-phosphate