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In the title compound, C 21 H 19 ClO 3 , the two cyclo­hexenone rings adopt half-chair conformations, whereas the pyran ring adopts a boat conformation. The 4-chloro­phenyl ring is almost perpendicular to the plane through the four C atoms of the pyran ring [dihedral angle = 87.97 (6)°]. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into a chain parallel to the  a -axis.

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