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In the title compound, C22H32N2O3, the tetra­hydro­quinoxaline unit is planar. The ester substituent is nearly coplanar with this ring system as a result of an intra­molecular N—H⋯O hydrogen bond. In the crystal, C—H⋯O hydrogen bonds and π-stacking inter­actions form oblique stacks which are connected into pairs by additional C—H⋯O hydrogen bonds. These pairs are further linked into thick sheets, with the n-decyl chains extending out from both surfaces as a result of a third set of C—H⋯O hydrogen bonds. Inter­calation of the n-decyl chains completes the crystal packing.

Ethyl 2-[(2E)-4-decyl-3-oxo-1,2,3,4-tetrahydroquinoxalin-2-ylidene]acetate