In the title compound, C(22)H(14)N(2)O(2), the five rings of the mol-ecule are not coplanar. There is a significant twist between the four fused rings, which have a slightly arched conformation, and the pendant aromatic ring, as seen in the dihedral angle of 13.16 (8)° between the anthraquinonic ring system and the pendant aromatic ring plane.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2977743PMC
http://dx.doi.org/10.1107/S1600536809013634DOI Listing

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