4-[(2,5-Dimethyl-1,3-thia-zol-4-yl)meth-yl]-4-hydr-oxy-2-methyl-isoquinoline-1,3(2H,4H)-dione

In the title isoquinoline-dione compound, C(16)H(16)N(2)O(3)S, the piperidine ring in the tetra-hydro-isoquinoline ring system adopts a half-boat conformation. The essentially planar thia-zole ring [maximum deviation = 0.007 (2) Å] makes a dihedral angle of 34.49 (7)° with the mean plane through the tetra-hydro-isoquinoline ring system. In the crystal structure, two neighbouring mol-ecules are linked via pairs of O-H⋯N and C-H⋯O hydrogen bonds into inversion-related dimers incorporating R(2) (2)(9) hydrogen-bond ring motifs. These dimers are further linked by weak inter-molecular C-H⋯π inter-actions.