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The name of one of the authors in the paper by Hussain et al. [Acta Cryst. (2010), E66, o1881] is corrected.[This corrects the article DOI: 10.1107/S1600536810025341.].

In the title compound, C(13)H(13)N(3)O, the phenyl and pyrrole rings are inclined at 47.45 (8)°. In the crystal, inter-molecular N-H⋯O and C-H⋯O hydrogen bonds form R(2) (1)(6) ring motifs. Mol-ecules connected through these hydrogen bonds are arranged into polymeric chains extending along the c axis.

In the title compound, C(14)H(12)ClN(3)O(2)·H(2)O, the benzene ring and the pyridine rings are oriented at a dihedral angle of 57.73 (12)° and an intra-molecular O-H⋯N hydrogen bond generates an S(6) ring. In the crystal, the water mol-ecule forms O-H⋯O and O-H⋯N hydrogen bonds to the organic mol-ecule, leading to chains containing R(4) (4)(16) loops. In addition, weak aromatic π-π stacking inter-actions between the centroids of pyridine rings [at distance of 3.864 (2) and 4.013 (2) Å] and C-H⋯π inter-actions occur.

In the title compound, C(15)H(14)N(2)O(3), the phenyl ring is disordered over two set of sites with an occupancy ratio of 0.810 (3):0.190 (3); the dihedral angle between the two components is 72.3 (4)°. The benzene and phenyl rings are oriented at dihedral angles of 69.18 (8) and 26.0 (5)° (major and minor orientations, respectively), and an intra-molecular O-H⋯O hydrogen bond occurs. In the crystal, mol-ecules are linked by N-H⋯O, O-H⋯O and C-H⋯O inter-actions, generating a three-dimensional network.

In title compound, C(11)H(8)BrN(3)OS, the dihedral angle between the two aromatic rings is 27.61 (14)° and the Br atom is disordered over two sites with an occupancy ratio of 0.804 (2):0.196 (2). In the crystal, the mol-ecules are linked by N-H⋯O, C-H⋯O and C-H⋯N inter-actions, resulting in chains.

The title compound, C(12)H(9)BrN(2)OS·0.06H(2)O, is a hydrated Schiff base derived from benzoic hydrazide and 4-bromo-thio-phene-2-carboxaldehide. The two Schiff base mol-ecules in the asymmetric unit differ crystallographically: in one mol-ecule the dihedral angle between the benzene ring and thio-phene ring is 49.88 (11)°, whereas the other mol-ecule the rings are almost coplanar with an r.m.s. deviation for the non-H atoms of 0.025 Å. In the crystal, mol-ecules form polymeric sheets linked by N-H⋯O and C-H⋯O hydrogen bonds. The water mol-ecule of crystallization is partially occupied and its H atoms could not be located.

The title compound, C(17)H(16)N(2)O(5)S, crystallized in the chiral monoclinic space group P2(1), with two enanti-omeric mol-ecules (A and B) in the asymmetric unit. It is composed of a methyl-imidazolidine-2,4-dione unit substituted with a phenyl group and a 4-methoxy-phenyl-sulfonyl group. The benzene ring mean planes are inclined to one another by 22.20 (14)° in mol-ecule A and by 15.82 (13)° in mol-ecule B. In the crystal structure, the A and B mol-ecules are linked by N-H⋯O hydrogen bonds, forming centrosymmetric dimers. A number of C-H⋯O inter-actions are also present in the crystal structure, leading to the formation of a three-dimensinoal network.

The title compound, C(16)H(12)ClFN(2)O(4)S, crystallizes with two independent mol-ecules (A and B) in the asymmetric unit. The two mol-ecules are U-shaped with similar geometries and conformations. The mean planes through the benzene rings are inclined to one another by 6.07 (8)° in mol-ecule A and 8.67 (8)° in mol-ecule B. They are separated with a centroid-centroid distance of 3.9096 (10) Å in mol-ecule A and 3.9118 (10) Å in mol-ecule B. Mol-ecules A and B lie adjacent to one another, with a centroid-centroid distance of 3.7592 (10) Å between the fluoro-phenyl ring of mol-ecule A and the chloro-phenyl-sulfonyl ring of mol-ecule B and with a dihedral angle of 5.75 (8)° between the ring planes. In the crystal structure, A and B mol-ecules are linked by N-H⋯O hydrogen bonds, forming centrosymmetric dimers. These dimers stack along the [110] direction and are linked by C-H⋯O and C-H⋯F inter-actions. There are also some short halide⋯halide contacts [Cl⋯F = 3.0499 (14) and 3.1224 (13) Å, and F⋯F = 3.0612 (17) Å].

In the title compound, C(10)H(9)FN(2)O(2), the dihedral angle between the hydantoin unit and the benzene ring is 65.55 (5)°. The atoms in the hydantoin ring are coplanar, with a mean deviation of 0.015 Å and a maximum deviation of 0.075 (2) Å for one carbonyl O atom. N-H⋯O hydrogen bonds link the mol-ecules into one-dimensional chains, with one carbonyl group acting as a bifurcated acceptor and the other accepting no hydrogen bonds.