Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.003 Å; R factor = 0.070; wR factor = 0.190; data-to-parameter ratio = 22.6.In the title compound, C 21 H 24 O 3 , the conformation of the enone group is s-cis. The benzene rings are inclined at an angle of 7.9 (1) . The alkoxy tail is planar, with a maximum deviation from the least-squares plane of 0.009 (2) Å , and adopts a trans conformation throughout. An intramolecular O-HÁ Á ÁO interaction between the keto and hydroxy groups forms S(6) ring motifs. In the crystal, molecules are arranged in a head-to-tail manner down the a axis and are subsequently stacked along the b axis, forming molecular sheets parallel to the ab plane. The crystal structure is further stabilized by weak C-HÁ Á Á interactions and short CÁ Á ÁO [3.376 (2) Å ] contacts.
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