3-Benzoyl­methyl­ene-1-methyl-3,4-dihydro­quinoxalin-2(1H)-one

In the title compound, C₁₇H₁₄N₂O₂, the quinoxaline ring is essentially planar and makes a dihedral angle of 9.1 (2)° with the benzene ring of the benzoyl­methyl­ene group. There are intra­molecular N—H...O hydrogen bonds and inter­molecular C—H...O inter­actions.