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The title compound, C10H10O4, crystallizes in the triclinic space group P\overline 1 with two half-mol­ecules in the asymmetri unit; both molecules are located on inversion centres.

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In the title compound, C22H15BrN2, the phenanthrene moiety is slightly skewed. The dihedral angle between the phenanthro­[9,10-d]­imidazole mean plane and the benzene ring is 37.78 (6)°. The crystal packing is stabilized mainly by aromatic interactions, though a weak intermolecular C—H...N hydrogen bond is also observed.
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