Crystal structure of (E)-3-(2,4-di-meth-oxy-phen-yl)-1-(1-hy-droxy-naphthalen-2-yl)prop-2-en-1-one.

In the title compound, C21H18O4, the C=C bond of the central enone group adopts an E conformation. The dihedral angle formed by the benzene ring and the naphthalene ring system is 6.60 (2)°. The meth-oxy groups on the benzene ring are essentially coplanar with the ring; the C-C-O-C torsion angles being 1.6 (2) and -177.1 (1)°. The hy-droxy group attached to the naphthalene ring is involved in an intra-molecular O-H⋯O hydrogen bond. The relative conformation of the two double bonds in the enone group is s-cisoid. In the crystal, weak C-H⋯O hydrogen bonds link the mol-ecules into chains propagating along [010].