3-(1-Adamant-yl)-6-methyl-3-(3-methyl-benz-yl)isochroman-1-one.

In the title compound, C(28)H(32)O(2), the oxanone ring adopts distorted half-boat conformation with the following Cremer and Pople puckering parameters: Q = 0.619 (2) Å, θ = 0.75 (19) and ϕ = 172 (13)°. The dihedral angle betwen two benzene rings is 21.32 (7)°. The adamantane unit consists of three fused cyclo-hexane rings in classical chair conformations, with absolute values of C-C-C-C torsion angles in the range 57.5 (2)-60.9 (2)°. Weak inter-actions of the type C-H⋯O link mol-ecules of each enanti-omer into chains parallel to the b axis and lying about inversion centers. The crystal packing is also stabilized by inter-molecular π-π stacking inter-actions [centroid-centroid distance of 3.8566 (11) Å].