A muco-complex (fraction GII) obtained from Micrococcus lysodeikticus in a preparative scale was hydrolyzed with lysozyme and the hydrolysate was fractionated into several components. From one of the fractions, a disaccharide consisting of acetylglucosamine and acetylmuramic acid was isolated. Further, a sequence of peptide linkage, -Lys-Ala- (Ala-Gly), in the muco-complex was established.
