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C6H4N204 is monoclinic, space group P21/n , with a = 11.137(2), b = 5.461 (1), c = 5.684(3) /l,, fl = 92.22 (4) ° , Z = 2. The final R is 0.0408 for 559 independent counter intensities. The benzene ring has mmm symmetry within experimental error. The distortions from 6/mmm symmetry are quite marked, and involve bond lengths as well as angles; they testify to the strong a-electron-withdrawing character of the substituent. The value of the internal angle at the ipso atom, CtNo 2 = 123.4 (1) °, is in good agreement with values reported for other molecules where the nitro group is para to a 7r acceptor.

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