1-Acetyl-5-meth­oxy-4-(phenyl­sulfan­yl)imidazolidin-2-one

The title compound, C₁₂H₁₄N₂O₃S, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit. The five-membered imidazolidin-2-one rings in both mol­ecules are twisted about the C—C bond. In the crystal, the A and B mol­ecules are associated via pairs of N—H...O hydrogen bonds, forming A–B dimers. These dimers are linked via C—H...S hydrogen bonds, forming double dimers, which are in turn linked via C—H...O hydrogen bonds forming two-dimensional networks lying parallel to (001). There are also C—H...π inter­actions present, which consolide the layers and link them, so forming a three-dimensional structure.

3-[2-(4-Fluoro­phen­yl)-2-oxoeth­yl]-5,5-di­phenyl­imidazolidine-2,4-dione

The title compound, C₂₃H₁₇FN₂O₃, crystallizes with two independent mol­ecules in the asymmetric unit. The mol­ecules are connected by pairs of N—H...O hydrogen bonds and have slightly different conformations, as indicated by the dihedral angles between the central imidazolidine-2,4-dione ring and its three substituents. In one mol­ecule, these are 60.56 (1) and 82.66 (9)° to the phenyl rings and 84.35 (16)° to the 2-(4-fluoro­phen­yl)-2-oxoethyl side chain. In the other mol­ecule, the corresponding angles are 66.35 (10), 84.94 (9) and 86.31 (16)°. In the crystal, weak C—H...O inter­actions leading to a three-dimensional supramolecular architecture.

2-Meth­oxy-4,6-di­phenyl­nicotino­nitrile

In the title compound, C₁₉H₁₄N₂O, the phenyl rings form dihedral angles of 10.90 (10) and 42.14 (6)° with pyridine ring and an angle of 35.7 (2)° with each other. The orientation of the meth­oxy group is defined by the C-O-C-N torsion angle of 4.9 (2)°.

N-(12-Amino-9,10-di­hydro-9,10-ethano­anthracen-11-yl)-4-methyl­benzene­sulfonamide

The title compound, C₂₃H₂₂N₂O₂S, crystallizes with the 4-methyl­benzene­sulfonamide entity oriented towards the center of the bridgehead C atoms with a C—N—S—C torsion angle of −61.3 (2)°. The mol­ecule features an intra­molecular N—H...N hydrogen bond. Weak C—H...O and C—H...π inter­actions aid in forming the three-dimensional supra­molecular structure.

3-Amino-5,5-di­phenyl­imidazolidine-2,4-dione

The title compound, C₁₅H₁₃N₃O₂, crystallizes with two independent mol­ecules in the asymmetric unit, which differ considerably in the dihedral angles made between the phenyl groups and the five-membered rings [47.19 (8) and 61.16 (9)° in one mol­ecule and 55.04 (10) and 55.00 (8)° in the other]. In the crystal, N—H...O hydrogen bonds generate columnar units having approximate fourfold rotational symmetry about axes parallel to b.

4-[(1,3-Dioxoisoindolin-2-yl)meth­yl]benzene­sulfonamide

The title compound, C₁₅H₁₂N₂O₄S, is V-shaped with the isoindoline ring system (r.m.s. deviation = 0.006 Å) inclined to the benzene ring by 84.27 (13)°. In the crystal, inversion dimers are formed via pairwise N—H...O hydrogen bonds. These dimers associate further into corrugated ribbons, via pairwise N—H...O and C—H...O hydrogen bonds, propagating along the a-axis direction and lying parallel to (001).