Abstract
In the title compound, C12H13ClN2O2, the terminal C atoms of the ethyl groups deviate from the mean plane of the quinoxaline-2,3(1H,4H)-dione ring (r.m.s. deviation = 0.016 Å) in opposite directions by −1.451 (2) and 1.472 (2) Å. In the crystal, weak C—H...O interactions link the molecules into [100] chains and aromatic π–π stacking interactions [shortest centroid–centroid separation = 3.6631 (9) Å] are also observed.
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