The title compound, C(26)H(30)O(4), is one of the first alkyl bis-peroxides to be structurally characterized. The molecule lies on a centre of inversion and therefore the terminal phenyl rings are parallel. Although there are three aromatic rings in the molecule, the C-O-O-C torsion angle of 163.10 (10) degrees is close to the value found in Me(3)COOCMe(3).