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The ring system in the title compound, C 14 H 4 N 4 O 12 , is essentially planar (r.m.s. deviation of the carbon atoms = 0.085 Å); the two hydr­oxy groups form intra­molecular hydrogen bonds to the same carbonyl O atom. The nitro groups are twisted with respect to the mean plane of the ring system by 74.3 (1) (1-nitro), 42.3 (3) (3-nitro), 45.7 (3) (6-nitro) and 66.9 (1)° (8-nitro).

1,8-Dihydroxy-2,4,5,7-tetranitro-9,10-anthraquinone