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

In the title isoquinolinedione derivative, C(16)H(16)N(2)O(4), the piperidine ring in the tetrahydroisoquinoline unit adopts a half-boat conformation. The essentially planar oxazole ring [maximum deviation = 0.004 (2) angstrom] is inclined at a dihedral angle of 36.00 (8)degrees to the tetrahydroisoquinoline unit. In the crystal structure, pairs of intermolecular C-H center dot center dot center dot O and O-H center dot center dot center dot N interactions link the molecules into chains incorporating R(2)(2)(9) ring motifs. Two neighbouring chains are further interconnected by intermolecular C-H center dot center dot center dot O interactions into chains two molecules wide along the a axis.