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.

The title compound, C22H17ClN2O2, crystallizes with two independent molecules (AandB) in the asymmetric unit. The 6-chloroquinoxaline-2,3(1H,4H)-dione ring system is essentially planar. The dihedral angles between the mean planes of the 6-chloroquinoxaline-2,3(1H,4H)-dione ring and the phenyl rings of the benzyl substituents in the two molecules are 68.34 and 73.8 (7)° forA, and 73.8 (5) and 80.7 (1)° forB, so that these rings point away from the quinoxaline ring system. In the crystal, weak C—H...O hydrogen bonds and π–π stacking interactions link the molecules into a three-dimensional network.

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