{6-[2,5-Bis(chloromethyl)-3,4-dihydroxytetrahydrofuran-2-yloxy]-3-chloro-4,5-dihydroxy-3,4,5,6-tetrahydro-2H-pyran-2-yl}methyl acetate dihydrate

The title compound, C14H21Cl3O9·2H2O, is a disaccharide constructed from a galactose and a fructose. In the molecular structure, the tetrahydrofuran five-membered ring and tetrahydropyran six-membered ring assume envelope and chair conformations, respectively. An extensive O—H...O hydrogen-bonding network occurs in the crystal structure.