1-Acetyl-5-isobutyl-2-sulfanylidene-imidazolidin-4-one.

There are two independent mol-ecules in the asymmetric unit of the title compound, C(9)H(14)N(2)O(2)S. In the crystal, the mol-ecules are linked by N-H⋯O hydrogen bonds, forming a chain along the a axis.

1,5-Bis(2-chloro-benzyl-idene)carbonohydrazide.

In the title mol-ecule, C(15)H(12)Cl(2)N(4)O, the two benzene rings are inclined at a dihedral angle of 14.5 (2)°. In the crystal, inter-molecular N-H⋯O hydrogen bonds link mol-ecules into chains propagated in [001].

1,5-Bis(4-bromo-phen-yl)-3-phenyl-pentane-1,5-dione.

The asymmetric unit of the title compound, C(23)H(18)Br(2)O(2), contains two independent mol-ecules with slightly different conformations. In the absence of classical inter-molecular inter-actions, the crystal packing is stabilized by van der Waals forces.