N-(3-Octyl-4-oxo-1,3-thia-zolidin-2-yl-idene)benzamide.

In the title compound, C(18)H(24)N(2)O(2)S, the thia-zolidinone ring is almost coplanar [maximum atomic deviation = 0.017 (3) Å], and is coplanar with the phenyl ring [dihedral angle = 0.62 (13)°]. The octyl group displays an extended conformation. In the crystal, weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into supra-molecular chains along [210].

N-(3-Butyl-4-oxo-1,3-thia-zolidin-2-yl-idene)benzamide.

In the title compound, C(14)H(16)N(2)O(2)S, the thia-zolidine ring is planar [maximum atomic deviation = 0.0080 (14) Å] and twisted slightly with respect to the phenyl ring, making a dihedral angle of 4.46 (14)°. The butyl group displays an extended conformation, with a torsion angle of 169.4 (4)°. In the crystal structure, weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules, forming supra-molecular chains.

(Z)-2-[(2,4-Dimethyl-phen-yl)imino]-1,3-thia-zinan-4-one.

In the title compound, C(12)H(14)N(2)OS, the 1,3-thia-zinane ring displays a screw-boat conformation. In the crystal, pairs of centrosymmetrically related mol-ecules are linked by pairs of N-H⋯O hydrogen bonds into dimers. C-H⋯π inter-actions occur between adjacent dimers.