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organic compounds
Racemic crystals of the atropisomeric title compound, C16H14N2O5, are composed of independent molecules separated by normal van der Waals distances. The molecule, as well as its central seven-membered ring, has an approximate C2 symmetry. The nitro groups are twisted from coplanarity with the phenyl rings by 11.5 (3) and 15.6 (3)°.