preferred_name: an N(4)-(oligosaccharide-(1->3)-[oligosaccharide-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-alpha-D-GlcNAc)-L-asparaginyl-[protein] + H2O = an oligosaccharide-(1->3)-[oligosaccharide-(1->6)]-beta-D-Man-(1->4)-D-GlcNAc + N(4)-(N-acetyl-beta-D-glucosaminyl)-L-asparaginyl-[protein]