3-[(E)-3-(2,4-Dichlorophenyl)prop-2-enoyl]-4-hydroxy-2H-chromen-2-one

In the title compound, C18H10Cl2O4, the chromen-2-one ring system is almost planar [maximum deviation = 0.028 (1) angstrom] and is inclined at an angle of 16.35 (4)degrees with respect to the benzene ring. The C=C bond has an E configuration. The molecular conformation is stabilized by an almost symmetric intramolecular O center dot center dot center dot H center dot center dot center dot O hydrogen bond and a C-H center dot center dot center dot O interaction, both of which form S(6) ring motifs. In the crystal structure, molecules are linked into sheets lying parallel to (100) via intermolecular C-H center dot center dot center dot O hydrogen bonds. The crystal packing is further consolidated by pi-pi stacking interactions [centroid-to-centroid separation = 3.6615 (6) angstrom].