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The title compound, C28H18O2S, is composed of a naphthalene ring system fused with a benzo-thio-phene ring and attached to two phenyl rings. The phenyl rings make dihedral angles of 70.92 (8) and 79.23 (8)° with the essentially planar naphthalene ring system (r.m.s. deviation = 0.031 Å). There is an intra-molecular C-H⋯π inter-action present. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds which generate C(7) zigzag chains running parallel to [10-1]. The chains are linked via further C-H⋯π inter-actions, forming a three-dimensional structure.

acta crystallographica. section e

Crystal structure of 2,9-diphenyl-17λ6-thiatetracyclo[8.7.0.03,8.011,16]heptadeca-1(10),2,4,6,8,11(16),12,14-octaene-17,17-dione