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The title compound, C19H19NO10, was obtained from the reaction of α-D-1-bromo-2,3,4-tri-O-acetylxylose with N-hy­droxy­phthalimide in the presence of potassium carbonate. The asymmetric unit contains two independent mol­ecules, in which the O—CH—O—N torsion angles are 73.0 (4) and 65.0 (4)°. The hexa­pyranosyl rings adopt chair conformations and the substituent groups are in equatorial positions. In the crystal, mol­ecules are linked by nonclassical C—H...O hydrogen bonds.

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The asymmetric unit of the title compound, (C6H7ClN)4[SnCl6]Cl2, comprises two 4-chloro­anilinium cations, half of an [SnCl6]2− anion and a Cl anion. The SnIV atom, located on a special position on a twofold rotation axis, exhibits an octa­hedral environment. In the crystal, mol­ecules are linked by N—H...Cl hydrogen bonds between the 4-chloro­anilinium cations, [SnCl6]2− anions and Cl anions.

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All non-H atoms of the title compound, C8H4Cl2N4, are essentially coplanar, with an r.m.s. deviation of 0.011 Å. In the crystal, weak C—H...N hydrogen bonds link the mol­ecules into infinite sheets parallel to the bc plane.

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In the title compound, [Zn2(C8H4O6)(C12H8N2)2(H2O)6](C8H4O6), the complete ions of both the binuclear dication and the dianion are generated by crystallographic inversion symmetry. The Zn atom is bonded to an N,N′-bidentate phenanthroline ligand, three water moleules and an O-mono­denate 2,5-dihy­droxy­terephthalate dianion. In the resulting distorted octa­hedral ZnN2O4 coordination poly­hedron, the water O atoms are in a mer orientation. Two intra­molecular O—H...O hydrogen bonds occur in the bridging 2,5-dihy­droxy­terephthalate dianion within the complex cation and also in the free dianion. An intra­molecular Ow—H...O (w = water) hydrogen bond also occurs within the dication. In the crystal, O—H...O hydrogen bonds link the component ions into a three-dimensional network.

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In the crystal structure of the title salt, C5H6N3O2+·C6H5O4S, N—H...O and O—H...O hydrogen bonds link the cations and anions. The dihedral angle between the rings of the cation and anion is 79.91 (6)°.
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