The molecule is an oligosaccharide phosphate consisting of four alpha(1->3)-linked D-mannose residues, with the residue at the non-reducing end carrying a phosphate group at position 6, and with that at the reducing end being alpha(1->2)-linked to a further D-mannose residue; prepared from the phosphomannan fraction of Hansenula holstii. It has a role as an epitope.
[(2R,3S,4S,5S,6R)-6-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-2-(hydroxymethyl)-6-[(3S,4S,5S,6R)-2,4,5-trihydroxy-6-(hydroxymethyl)oxan-3-yl]oxyoxan-4-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methyl dihydrogen phosphate