(E)-9-(4-Fluoro­styr­yl)-3,3,6,6-tetra­methyl-3,4,5,6,7,9-hexa­hydro-2H-xanthene-1,8-dione

In the title compound, C₂₅H₂₇FO₃, each of the cyclo­hexenone rings adopts a half-chair conformation, whereas the six-membered pyran ring adopts a flattened boat conformation, with the O and methine C atoms deviating by 0.0769 (15) and 0.196 (2) Å, respectively, from the plane of the other four atoms (r.m.s. deviation = 0.004 Å). The C=C double bond adopts an E conformation. The dihedral angle between the benzene and pyran (all atoms) rings is 89.94 (10)°. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into chains running parallel to the b axis.