The molecule is a trisaccharide consisting of D-mannopyranose residue and two D-arabinofuranose residues joined in sequence by (1->2) and (1->5) glycosidic bonds. It derives from a D-Manp-(1->2)-D-Araf.
(3S,4S,5S,6R)-2-[(3S,4R,5R)-4-hydroxy-5-(hydroxymethyl)-2-[[(2R,3S,4S)-3,4,5-trihydroxyoxolan-2-yl]methoxy]oxolan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol