作者: Peter G. Jones , Holger Thönnessen , Reinhard Schmutzler , Axel K. Fischer
DOI: 10.1107/S1600536802021244
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摘要: The title compound, C7H6N2O3, crystallizes as a second P21/c polymorph. Compared to the previously known form [Di Rienzo et al. (1977). Acta Cryst. B33, 3854–3858], amide group is rotated much further out of ring plane (ca 20°). molecules are linked by symmetric three-centre N—H(⋯Onitro)2, and N—H⋯Oamide hydrogen bonds layers parallel bc plane.