EC 3.2.1.33; other name: dextrin 6-α-d-glucosidase; an enzyme that catalyses the endohydrolysis of 1,6-α-d-glucoside linkages at points of branching in chains of 1,4-linked α-d-glucose residues. The human enzyme also has glycogen debranching (4-α-glucanotransferase) activity.