Crystal structure of ethyl 2-{4-[(2-oxo-3-phenyl-1,2-di-hydro-quinoxalin-1-yl)meth-yl]-1 H -1,2,3-triazol-1-yl}acetate.

The quinoxaline portion of the title mol-ecule, C 21 H 19 N 5 O 3 , is not quite planar as indicated by a dihedral angle of 3.38 (7)° between the constituent rings. The mol-ecule is 'U-shaped', which is consolidated by an intra-molecular anti-parallel carbonyl electrostatic inter-action with C··O distances of 2.8905 (16) and 3.0221 (15) Å, in the crystal forms corrugated layers through C-H⋯O and C-H⋯N hydrogen bonds and C-H⋯π(ring) and π-stacking inter-actions.