In the title mol­ecule, C₁₆H₁₀F₃NO, the N-bound phenyl ring is oriented nearly orthogonal to the quinolinyl ring in order to avoid steric clashes with the trifluoro­methyl substituent [dihedral angle 89.7 (1)°].

In the title compound, C₂₀H₁₉N₃O₄S, a novel tubulin ligand active against human cancer, the dihedral angle between the pyridine ring and the carbazole ring system is 42.87 (10)°. In the crystal, the mol­ecules are held together by N—HO and C—HO hydrogen bonds into layers, which are assembled into a three-dimensional network via π–π stacking inter­actions between inversion-related pyridine rings, with centroid–centroid distances of 3.5101 (12) Å.

The title complex, (C₆H₁₆N)₂[Zn(H₂O)₆](C₁₀H₆O₆S₂)₂, is formed by aggregation of one hexa­hydrated zinc(II) cation, two triethyl­aminium cations and two naphthalene-1,6-disulfonate dianions. The Zn^II cation is six-coordinate and located at an inversion center. The coordination around the metal ion is octa­hedral, with tetra­gonal elongation.

In the title compound, C₆H₁₆N⁺·C₂HCl₂O₂⁻, the cation exhibits non-crystallographic C₂ symmetry. In the crystal, the components are linked by N—HO and C—HO hydrogen bonds into chains propagating along [010].

In the title compound, C₁₀H₁₀N₂O₃, the five-membered imidazolidine ring is planar, with an r.m.s. derivation of 0.0243 (1)Å. The dihedral angle between the imidazolidine ring and the phenyl ring is 78.83 (2)°. A centrosymmetric ring is formed by a pair of N—HO hydrogen bonds, creating a dimer; C—HO hydrogen bonds connect these dimers into a three-dimensional network.

In the title structure, C₂₅H₂₄FN₃O₅, a strong intra­molecular O—HO hydrogen bond is present between the carb­oxy group at the 3-position and the carbonyl group at the 4-position. In the crystal, mol­ecules are held together by weak C—HO, C—HF and π–π [centroid–centroid distance 3.6080 (8) Å] inter­actions. The 1,4-dihydro­quinoline ring and cyclo­propyl group are not in the same plane, making an inter­planar angle of 57.52 (8)°.

The title compound [systematic name: 11β-hydr­oxy-24,25-ep­oxy-3,16-oxo-protost-13 (17)-en-23-yl acetate], C₃₂H₄₈O₆, a protostane-type triterpenoid, was isolated from the Chinese herbal medicine alismatis rhizoma (the rhizome of Alisma orientalis Juzep). The mol­ecule contains four trans-fused rings, viz. three six-membered and one five-membered ring. Two of the six-membered rings have slightly distorted half-chair conformations, while the third exhibits a chair conformation. The five-membered ring is almost planar. An inter­molecular O—HO hydrogen bond between the hydr­oxy and ep­oxy groups and intra- and intermolecular C—HO hydrogen bonds are observed.