The enzyme 1,5-anhydro-D-fructose dehydratase () catalyzes the chemical reaction
It catalyzes two steps in the anhydrofructose pathway process.
This enzyme belongs to the family of lyases, specifically the hydro-lyases, which cleave carbon-oxygen bonds. The systematic name of this enzyme class is 1,5-anhydro-<small>D</small>-fructose hydro-lyase (ascopyrone-M-forming). Other names in common use include 1,5-anhydro-<small>D</small>-fructose 4-dehydratase, 1,5-anhydro-<small>D</small>-fructose hydrolyase, 1,5-anhydro-<small>D</small>-arabino-hex-2-ulose dehydratase, AFDH, AF dehydratase, and 1,5-anhydro-<small>D</small>-fructose hydro-lyase.