9,10-Dihydro-7H-benzo[de]imidazo[2,1-a]isoquinolin-7-one

In the title compound, C₁₄H₁₀N₂O, all non-H atoms are essentially coplanar (r.m.s. deviation = 0.013 Å). The crystal structure is stabilized by π–π stacking inter­actions [centroid–centroid distance = 3.506 (3) Å].