1,7,7-Trimethyl-3-(naphthalen-2-ylcarbon-yl)bi-cyclo-[2.2.1]heptan-2-one.

The title compound, C 21 H 22 O 2 , crystallizes in its keto form. The mol-ecules are connected via weak C-H⋯O inter-actions, forming infinite chains perpendic-ular to the [001] axis.