In the title hydrate, C26H16Cl4O4·H2O, the cyclobutane ring carries two 2,3-dichlorophenyl and two furan-2-ylmethanone substituents. It subtends dihedral angles of 86.6 (3) and 37.3 (3)° with the furan rings and 77.0 (5) and 77.0 (3)° with the dichlorophenyl rings. In the crystal, molecules are linked via weak C—H...O hydrogen bonds, forming chains propagating along the a-axis direction. Additional C—H...O and C—H...Cl hydrogen bonds generate a three-dimensional network of molecules stacked along the b axis.
