The molecule is a trisaccharide consisting of a beta-D-galactopyranose residue and two alpha-D-glucopyranose residues joined in sequence by (1->6) and (1->1) glycosidic bonds. It derives from an alpha,alpha-trehalose and an alpha-allolactose.
(2R,3R,4S,5R,6R)-2-(hydroxymethyl)-6-[[(2R,3S,4S,5R,6R)-3,4,5-trihydroxy-6-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]methoxy]oxane-3,4,5-triol