6,7-Di­methoxy-2-methyl-3,4-di­hydro­isoquinolin-1(2H)-one

In the title compound, C₁₂H₁₅NO₃, the iso­quinoline moiety is essentially planar, except for the N and adjacent Csp³ atoms, which deviate from the mean plane by 0.198 (2) and 0.686 (2) Å, respectively. The bond length between the N and carbonyl C atoms [1.353 (3) Å] is close to a double-bond value, indicating electron delocalization. No significant intermolecular interactions are observed.

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.