(2S)-3-sulfolactaldehyde + D-sedoheptulose 7-phosphate => 6-deoxy-6-sulfo-D-fructose + D-erythrose 4-phosphate
(2s)-3-sulfolactaldehyde + d-sedoheptulose 7-phosphate => 6-deoxy-6-sulfo-d-fructose + d-erythrose 4-phosphate