O-2-(Acetylamino)-2-deoxy-β-D-glucopyranosyl-(1→4)-O-(N-acetyl-β-muramosyl)-(1→4)-O-2-(acetylamino)-2-deoxy-β-D-glucopyranosyl-(1→4)-N-acetylmuramic Acid, is the N-acyl substituted compound used as a substrate for lysozyme, the enzyme catalyzing the hydrolysis of bacteria cell walls.