2-Bromo­benz­[a]­anthracene-5,6,7,12-tetraone-5-di­methyl­ketal

In the title compound, 2-bromo-5,5-di­methoxy­benzo­[a]­anthracene-6,7,12(5H)­trione, C20H13BrO5, the two aromatic rings are essentially planar and make a dihedral angle of 15.1 (2)° with one another, while the di­methoxy-substituted cyclo­hexane ring is non-planar, as expected. An intramolecular C—H⋯O interaction is present, with C⋯O = 2.814 (5) A and C—H⋯O = 125°.