. "The reaction involves an intramolecular skeletal rearrangement, with the bonds in D-ribulose 5-phosphate that connect C-3 and C-5 to C-4 being broken, C-4 being removed as formate and reconnection of C-3 and C-5." . "The phosphorylated four-carbon product (L-3,4-dihydroxybutan-2-one 4-phosphate) is an intermediate in the biosynthesis of riboflavin." . . . "3,4-dihydroxy-2-butanone-4-phosphate synthase" . "DHBP synthase" . "L-3,4-dihydroxybutan-2-one-4-phosphate synthase" . "D-ribulose 5-phosphate = formate + L-3,4-dihydroxybutan-2-one 4-phosphate." . "Magnesium" .