The molecule is a heparan composed of a backbone of repeating beta-D-glucuronosyl-(1->4)-alpha-D-glucosamine units joined by (1->4)-linkages. It derives from a D-glucopyranuronic acid. It is a tautomer of a heparosan D-glucuronic acid zwitterion.
(2S,3S,4S,5R,6R)-6-[(2R,3S,4R,5R,6S)-5-amino-4,6-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid