4.2.1.111 1,5-anhydro-D-fructose dehydratase glycogen degradation III (via anhydrofructose) 4.2.2.13 exo-(1->4)-alpha-D-glucan lyase glycogen degradation III (via anhydrofructose) 5.3.2.7 ascopyrone tautomerase glycogen degradation III (via anhydrofructose)