4-[(2,4-Dimethyl-1,3-oxazol-5-yl)methyl]-4-hydroxy-2-methylisoquinoline-1,3(2H,4H)-dione

In the title isoquinolinedione derivative, C16H16N2O4, the piperidine ring in the tetrahydroisoquinoline unit adopts a half-boat conformation. The essentially planar oxazole ring [maximum deviation = 0.004 (2) Å] is inclined at a dihedral angle of 36.00 (8)° to the tetrahydroisoquinoline unit. In the crystal structure, pairs of intermolecular C—H...O and O—H...N interactions link the molecules into chains incorporating R22(9) ring motifs. Two neighbouring chains are further interconnected by intermolecular C—H...O interactions into chains two molecules wide along the a axis