D-GlcpNAc-(1->3)-D-GalpNAc
d-glcpnac-(1->3)-d-galpnac
An amino disaccharide consisting of 2-acetamido-2-deoxy-<small>D</small>-glucopyranose and 2-acetamido-2-deoxy-<small>D</small>-galactopyranose joined in sequence by a (1→3) glycosidic bond.