The molecule is a branched tetrasaccharide consisting of beta-D-mannose having two alpha-D-mannosyl residues attached at the 3- and 6-positions as well as a beta-D-xylosyl residue at the 2-position. It has a role as a carbohydrate allergen.
(2S,3S,4S,5S,6R)-2-[[(2R,3R,4S,5S,6R)-3,6-dihydroxy-4-[(2R,3S,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]methoxy]-6-(hydroxymethyl)oxane-3,4,5-triol