The molecule is a trisaccharide consisting of three mannopyranose residues linked beta(1->2), of which the residue at the reducing end is dehydroxylated at C-4.
(2S,3S,4S,5S,6R)-2-[(2S,3S,4S,5S,6R)-2-[(2R,3S,4S,6S)-2,4-dihydroxy-6-(hydroxymethyl)oxan-3-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol