Crystal structure of ethyl 2-{4-[(2-oxo-3-phenyl-1,2-di­hydro­quinoxalin-1-yl)meth­yl]-1H-1,2,3-triazol-1-yl}acetate

The quinoxaline portion of the title mol­ecule, 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 mol­ecule is ‘U-shaped’, which is consolidated by an intra­molecular anti­parallel carbonyl electrostatic inter­action 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 inter­actions. [Image: see text]