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In the title compound, C18H17ClN4O2, the dihydroquinoxaline moiety deviates slightly from planarity. The benzene ring and its chloro and methylene substituents are disordered over two sets of sites, with an occupancy ratio of 0.675 (3):0.325 (3). In the crystal, corrugated sheets parallel to (100) are formed by N—H...O, N—H...Cl and N—H...N hydrogen bonds. The structure was refined as a two-component inversion twin

2-{3-[2-(2-Chlorophenyl)ethyl]-2-oxo-1,2-dihydroquinoxalin-1-yl}acetohydrazide