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(1) GlcNH2, (2) GlcNSO3, (3) GlcNAc, (4a) p-HS, (4b) dnsp-HP, (5a) p-HP and (5b) b-HP. It should be noted that the free amino groups of GlcNH2 residues are protonated (R-NH3+) at physiological pH and that the polymer-derived uronic acid residues are β-D-glucuronic acid or α-L-iduronic acid. The repeat unit structures shown do not represent low energy conformations. Polymer residue abundance/substitution data is given in Table 1.
