In the title compound, C14H8ClN3S, the dihedral angle between the approximately planar triple-fused ring system (r.m.s. deviation = 0.065 Å) and the pendant phenyl ring is 62.25 (5)°. In the crystal, mol­ecules are linked into infinite chains along the c-axis direction by C—H⋯N hydrogen bonds. Aromatic π–π stacking inter­actions [centroid–centroid distances = 3.7499 (8) and 3.5644 (8) Å] and weak C—H⋯π inter­actions are also observed.

In the title compound, C23H24N4O5, the essentially planar benzimidazole ring system [maximum deviation = 0.008 (2) Å] forms a dihedral angle of 39.22 (7)° with the attached nitro­benzene ring. The pyrrolidin-2-one ring adopts an envelope conformation with a C atom as the flap. In the crystal, mol­ecules are connected by C—H⋯O inter­actions, forming sheets propagating in (011). The crystal packing also features weak π–π stacking inter­actions [centroid–centroid = 3.6746 (12) Å].

In the title compound, C24H20ClF2N3O3S, the essentially planar triazole ring (r.m.s. deviation = 0.001 Å) forms dihedral angles of 22.35 (10), 68.17 (10) and 42.01 (10)° with the mean planes of the trimeth­oxy­phenyl, chloro­phenyl and difluoro­phenyl rings, respectively. A weak intra­molecular C—H⋯π inter­action occurs. In the crystal, mol­ecules are linked into sheets lying parallel to the bc plane by C—H⋯O and C—H⋯N hydrogen bonds. The crystal packing also features weak C—H⋯π inter­actions.

The asymmetric unit of the title compound, C16H14N4O4, contains one half-mol­ecule of (nitro­phen­yl)ethanimine and the complete mol­ecule is generated by a crystallographic inversion centre. The mol­ecule has an E conformation with respect to each C=N double bond. The central C=N—N=C plane is twisted from the benzene rings with a dihedral angle of 24.76 (11)°. In the crystal, C—H⋯O inter­actions link the molecules to form sheets that lie parallel to (10-4).

In the title compound, C29H40O3, the enone moiety adopts an s-cis conformation. The dihedral angle between the benzene rings is 4.33 (5)° The least-squares mean line through the tetra­decyl side chain forms a dihedral angle of 83.99 (7)° with the normal to the attached benzene ring. In the crystal, O—H⋯O and C—H⋯O hydrogen bonds involving the keto and the hy­droxy O atoms form ribbons along [-41-1]. The crystal structure also features C—H⋯π inter­actions.

In the title compound, C20H28O4, a diterpenoid isolated from the roots of Premna obtusifolia (Verbenaceae), the five-membered ring is in a half-chair conformation. One six-membered ring exists in a twisted-boat conformation while the other is in half-boat conformation. The crystal packing is stabilized by inter­molecular O—H⋯O and weak C—H⋯O inter­actions, generating (001) sheets.

In the title mol­ecular salt, C11H17N2 +·Cl−, the piperazin-1-ium ring adopts a chair conformation with the aromatic ring in a pseudo-equatorial orientation. The dihedral angle between the benzene ring and the mean plane of the piperazin-1-ium ring is 51.22 (6)°. In the crystal, N—H⋯Cl hydrogen bonds link the mol­ecules into chains propagating in [100]. Weak C—H⋯π inter­actions also ocur.

In the title compound, C21H24O3, the enone moiety adopts an s-cis conformation and the dihedral angle between the benzene rings is 12.89 (6)°. The hex­yloxy tail adopts an extended conformation. In the crystal, inversion dimers are linked by pairs of O—H⋯O hydrogen bonds and pairs of C—H⋯O inter­actions, forming two R 2 2(7) and one R 2 2(10) loops. The dimers are then arranged into sheets lying parallel to (201) and weak C—H⋯π inter­actions consolidate the packing.