The molecule is a disaccharide consisting of L-threo-hex-4-enopyranuronose and 2-(sulfoamino)-D-glucopyranose residues joined in sequence by a (1->4) glycosidic bond. It derives from a 4,5-dehydro-D-glucuronic acid.
(3R,4R)-2-[(2R,3S,4R,5R)-4,6-dihydroxy-2-(hydroxymethyl)-5-(sulfoamino)oxan-3-yl]oxy-3,4,5-trihydroxy-3,4-dihydro-2H-pyran-6-carboxylic acid