The title compound, C40H62O4, is formed by γ irradiation and contains a tetracyclo[5.4.0.21,9.13,7]tetradecane moiety. The cage consists of bicyclo[2.2.2]octane and bicyclo[3.2.1]octane rings, which are connected via a C—C single bond that is common to both rings. The title compound is formally a dimer of the adduct of a cyclohexyl radical and a 3,5‐di‐tert‐butyl‐ortho‐quinone.