8H-Benzo[g][1,3]benzodioxolo[6,5,4-de]quinolin-8-one (oxocrebanine)

In the title compound, C₁₉H₁₃NO₅, the five fused rings are essentially coplanar, while one of the O—Me bonds lies almost perpendicular to that plane. The mol­ecule is stabilized by C—H...O inter­molecular hydrogen bonds, which form zigzag polymeric chains parallel to the b axis.