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The complete molecule of the title compound, C36H30S4 {common name: 1,4-[4-(9,17-dithia[3.3]metacyclophane)]-1,3-butadiyne}, is generated by a crystallographic inversion centre at the mid-point of the central C—C bond [1.367 (5) Å]. Both cyclophane units exist in cisoid pseudo-boat–chair chair–boat conformations. In the crystal, the packing is controlled by van der Waals interactions.

In the title compound, C13H19NO3, the hexyl chain has en extended conformation and its mean plane is inclined to the benzene ring by 3.29 (10)°. There is a short O—H...O contact in the molecule involving the adjacent hydroxy groups. In the crystal, molecules are linked via O—H...O and N—H...O hydrogen bonds, forming slabs parallel to (001). Within the slabs, there are also C—H...O hydrogen bonds and C—H...π interactions present.

In the title compound, C18H18N2O5, which was synthesized by reacting N,N′-bis-(3,4-dimethoxybenzoyl)hydrazine with POCl3, the dihedral angles between the central oxadiazole ring and pendant 3,4-dimethoxyphenyl rings are 11.37 (7) and 3.09 (7)°. In the crystal, weak C—H...O and π–π [shortest centroid–centroid separation = 3.7370 (11) Å] interactions are present, giving rise to a layered packing motif.

The title compound, C16H16O2S2·C4H8O2, is a cyclophane derivative, which was crystallized from an ethylacetate/methanol solvent system. The metacyclophane moiety exists with the benzene rings in the syn orientation, and with a pseudo chair–chair conformation for the dithia 12-membered ring. Both hydroxy groups are positioned on same side of this ring. In the crystal, the cyclophane and the lattice solvent are linked by O—H...O hydrogen bonds.

In the title compound, C25H20O12, commonly known as pentaacetylated quercetin, the benzene ring and one of its methoxy substituent groups is disordered (site occupancy ratio 0.523:0.427), with a dihedral angle between the major-disorder component and the benzene ring of the benzopyranone moiety of 10.8 (6)°. In the crystal, C—H...O hydrogen-bonding interactions give chains which extend along b.