2-(Benz­yloxy)iso­quinoline-1,3(2H,4H)-dione

The title compound, C₁₆H₁₃NO₃, exists in the keto form and the iso­quinoline system is essentially planar (mean deviation = 0.0424 Å). The dihedral angle between the aromatic rings is 4.2 (2)°. In the crystal, mol­ecules are linked via weak C—H...O hydrogen bonds and C—H...π inter­actions, forming a three-dimensional structure.

2-Hy­droxy­iso­quinoline-1,3(2H,4H)-dione

The title mol­ecule, C₉H₇NO₃, exists in the diketo form and the iso­quinoline unit is approximately planar (r.m.s. deviation = 0.0158 Å). In the crystal, mol­ecules are linked into inversion dimers through pairs of O—H...O hydrogen bonds and are further assembled into the (100) layers via stacking inter­actions [centroid–centroid distances = 3.460 (3) and 3.635 (4) Å].