The molecule is an L-threonine derivative in which L-threonine is linked via its nitrogen to C-6 of the non-reducing-end galactose residue of 3-O-acetyl-alpha-D-galacto-hexodialdo-1,5-pyranosyl-(1->3)-N-acetyl-acetamido-2-deoxy-beta-D-galactosamine; an important threonine-containing epitope of the Proteus penneri O-specific polysaccharide. It has a role as an epitope. It is an amino disaccharide and a L-threonine derivative.
(2S,3R)-2-[[(2S,3R,4S,5R,6S)-6-[(2R,3R,4R,5R,6R)-3-acetamido-2,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-4-acetyloxy-3,5-dihydroxyoxane-2-carbonyl]amino]-3-hydroxybutanoic acid