The molecule is a mannotetraose comprised of a trisaccharide unit of D-mannose residues linked sequentially alpha(1->3) and alpha(1->6), to the residue proximal to that at the reducing end is also linked alpha(1->6) a fourth D-mannose residue.
(3S,4S,5S,6R)-6-[[(2S,3S,4S,5R,6R)-3,5-dihydroxy-4-[(2S,3S,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl]oxymethyl]oxane-2,3,4,5-tetrol