Acta Cryst. (2011). E67, o2003 [ doi:10.1107/S1600536811024500 ]
Abstract: In the two molecules of the asymmetric unit of the title compound, C12H11N3O4, the seven-membered diazepine ring adopts a boat conformation (with the two phenylene C atoms representing the stern and the methine C atom the prow). The five-membered pyrrole ring, which has an envelope conformation, makes dihedral angles of 60.47 (10) and 54.69 (9)° with the benzene ring of the benzodiazepine unit in the two molecules. In the crystal, intermolecular N-HO hydrogen bonds and - stacking interactions [centroid-centroid distance = 3.8023 (7)-3.8946 (7) Å] lead to the formation of a three-dimensional framework.
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