Crystal structure of 2-cyclo-hexyl-1,3-thia-zolo[4,5-b]pyridine.

In the title compound, C12H14N2S, the cyclo-hexane ring adopts a chair conformation with the exocyclic C-C bond in an equatorial orientation. The mean plane through the cyclo-hexane ring (all atoms) is twisted from the thia-zolo-pyridine ring system (r.m.s. deviation = 0.013 Å) by 39.57 (6)°. In the crystal, mol-ecules form (100) sheets, although there are no specific directional inter-actions between them. The crystal stucture was refined as a two-component perfect twin.

Crystal structure of 2-(3-nitro-phen-yl)-1,3-thia-zolo[4,5-b]pyridine.

In the title compound, C12H7N3O2S, the dihedral angle between the planes of the thia-zolo-pyridine ring system (r.m.s. deviation = 0.005 Å) and the benzene ring is 3.94 (6)°. The nitro group is rotated by 7.6 (2)° from its attached ring. In the crystal, extensive aromatic π-π stacking [shortest centroid-centroid separation = 3.5295 (9) Å] links the mol-ecules into (001) sheets.

Crystal structure of 2-[4-(methyl-sulfan-yl)quinazolin-2-yl]-1-phenyl-ethanol.

In the mol-ecule of the title compound, C17H16N2OS, the almost planar methyl-sulfanylquinazoline group [the methyl C atom deviates by 0.032 (2) Šfrom the plane through the ring system] forms an inter-planar angle of 76.26 (4)° with the plane of the phenyl group. An intra-molecular O-H⋯N hydrogen bond is present between the quinazoline and hy-droxy groups. In the crystal, mol-ecules are stacked along the b-axis direction.