Tetra-kis{2,4-bis-[(1-oxo-2-pyridyl)-sulfanyl-methyl]mesitylene} acetone hemisolvate 11.5-hydrate.

In the crystal structure of the title compound, 4C(21)H(22)N(2)O(2)S(2)·0.5C(3)H(6)O·11.5H(2)O, there are four crystallographically independent mol-ecules (A, B, C, D) with similar geometries, 11 water mol-ecules and a solvent acetone mol-ecule which is disordered with a water mol-ecule with occupancy factors of 0.5:0.5. The dihedral angles formed by the mesitylene ring with the two pyridyl rings are 82.07 (3) and 78.39 (3)° in mol-ecule A, 86.20 (3) and 82.29 (3)° in mol-ecule B, 81.05 (3) and 76.0 (4)° in mol-ecule C, 86.0 (3) and 80.9 (3)° in moleule D. The two pyridyl rings form dihedral angles of 41.17 (4), 64.01 (3), 81.9 (3) and 82.25 (3)° in mol-ecules A, B, C and D, respectively. The crystal structure is stabilized by inter-molecular O-H⋯O hydrogen bonds and possible weak C-H⋯π inter-actions. Some short intra-molecular S⋯O contacts are apparent [2.684 (4)-2.702 (4) Å].