2-(Pyrene-1-yl)-1,3-dithiane.

In the title compound, C(20)H(16)S(2), the pyrene ring is planar [maximum deviation 0.0144 (15) Å] and the dithiane ring adopts a chair conformation. The crystal packing is stabilized by C-H⋯π inter-actions. An intra-molecular C-H⋯S hydrogen bond generates an S(5) ring motif.

2-(7-Hydr-oxy-2-naphth-yloxy)-N-(6-methyl-2-pyrid-yl)acetamide.

In the title compound, C(18)H(16)N(2)O(3), the dihedral angle between the naphthalene ring system and the pyridyl ring is 18.1 (8)°. The mol-ecules are inter-connected via C-H⋯O and O-H⋯O hydrogen bonds. Inversion-related mol-ecules are linked by O-H⋯O hydrogen bonds into cyclic centrosymmetric R(2) (2)(22) dimers. Intra-molecular N-H⋯O hydrogen bonding produces an S(5) ring motif. The crystal structure is further stabilized by weak C-H-π inter-actions.