(±)-1,11-Dimethyl-3,9-dinitro-5,7-dihydrodibenz[c,e]oxepine

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)°.

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