Experimental Crystal data

R factor = 0.043; wR factor = 0.132; data-to-parameter ratio = 19.1. In the title molecule, C18H18O4, the dihedral angle between the benzene rings is 52.52 (7). The C C bond of the central enone group adopts a trans conformation. The relative conformation of the two double bonds in the enone group is s-transoid. In the crystal, molecules are linked by pairs of weak C—H O hydrogen bonds, forming inversion dimers. Related literature For the synthesis and biological properties of chalcone deri-vatives, see: Shin et al. (2012); Hwang et al. (2011). For relate