[4)-alpha-L-GulpNAc3NAcA-(1->4)-betaManpNAc3NAcA-(1->]n
[4)-alpha-l-gulpnac3naca-(1->4)-betamanpnac3naca-(1->]n
A polysaccharide derivative composed of a repeating disaccharide unit, consisting of 2,3-diacetamido-2,3-dideoxy-<small>D</small>-mannuronic acid and 2,3-diacetamido-2,3-dideoxy-<small>L</small>-guluronic acid in an alternating linear sequence, joined by (1→4)-glycosidic linkages.