In the mol-ecule of the title compound, C(14)H(16)O(3), all non-H atoms except for one methyl C atom lie on a crystallographic mirror plane. The conformation with respect to the C=C bond [1.3465 (12) Å] is trans. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bonds into C(5) chains propagating along [100].