The molecule is a Delta(4)-beta-D-Glcp-(1->3)-D-GalpNAc6S in which the carbon bearing the anomeric hydroxy group has beta- configuration. It derives from a 4-deoxy-Delta(4)-beta-D-GlcpA2S-(1->3)-beta-D-GalpNAc.
(2R,3R,4R)-2-[(2R,3R,4R,5R,6R)-3-acetamido-2,5-dihydroxy-6-(sulfooxymethyl)oxan-4-yl]oxy-4,5-dihydroxy-3-sulfooxy-3,4-dihydro-2H-pyran-6-carboxylic acid