The molecule is an amino disaccharide consisting of N-acetyl-D-glucosamine having a 4-deoxy-alpha-L-threo-hex-4-enopyranuronosyl residue attached at the 3-position. It is an alpha,beta-unsaturated monocarboxylic acid, an amino disaccharide and a carbohydrate acid derivative.
(2R,3R,4S)-2-[(3R,4R,5S,6R)-3-acetamido-2,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3,4-dihydroxy-3,4-dihydro-2H-pyran-6-carboxylic acid