Hydrolysis of an N(4)-(acetyl-beta-D-glucosaminyl)asparagine residue in which the glucosamine residue may be further glycosylated, to yield a (substituted) N-acetyl-beta-D-glucosaminylamine and a peptide containing an aspartate residue. Heterodimer of a large and a small chain. Is highly glycosylated and is largly resistant against self-deglycosylation. The measured range is 165-?.