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The reaction of benzoyl chloride and ethyl-endi-amine in the presence of potassium thio-cyanate yielded a white solid, C 18 H 18 N 4 O 2 S 2 , which consists of two benzoyl-thio-ureido moieties connected by an ethyl-ene chain. The asymmetric unit consists of one half of the mol-ecule, the complete mol-ecule being generated by crystallographic inversion symmetry. Both thio-urea moieties are in a trans conformation. An intra-molecular N-H⋯O hydrogen bond occurs. In the crystal, C-H⋯S and C-H⋯O hydrogen bonds link the molecules, forming layers parallel to the ac plane.