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The title compound, C11H12N4O4, was synthesized by the reaction of (2,4-dinitrophenyl)hydrazine with cyclopentanone. The cyclopentyl fragment is disordered over two sites with occupancies of 0.63 (1) and 0.37 (1). An intramolecular N—H...O hydrogen bond helps to establish the conformation. Pairs of molecules are held together by π–π interactions between adjacent benzene rings [centroid-to-centroid distance 3.589 (2) Å].