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In the title compound, C(12)H(12)N(6)S(4), the two terminal thia-diazole rings are twisted with respect to the central benzene ring, making dihedral angles of 54.28 (4) and 76.56 (3)°. The dihedral angle between the two thia-diazole rings is 27.77 (4)°. Inter-molecular N-H⋯N hydrogen bonds stabilize the crystal packing, linking the mol-ecules into a tape along the b axis.

The asymmetric unit of the title compound, C(2)H(3)N(3)OS, contains three independent mol-ecules which are essentially planar, with r.m.s. deviations of 0.011 (2)-0.027 (2) Å from the mean plane defined by the seven non-H atoms. In the crystal, N-H⋯N and N-H⋯O hydrogen bonds link the mol-ecules into a sheet parallel to the (111) plane.

The asymmetric unit of the title compound, C(12)H(10)N(4)O(2)S(4)·2C(2)H(6)OS, contains one half of the p-xylene mol-ecule and one dimethyl sulfoxide mol-ecule. The p-xylene mol-ecule is located about a crystallographic inversion centre. In the mol-ecule, the thia-diazole and benzene rings are almost perpendicular to one another, with a dihedral angle of 88.95 (6)°. In the crystal, an N-H⋯O hydrogen bond is observed between the two components. The dimethyl sulfoxide mol-ecule is disordered over two orientations with an occupancy ratio of 0.879 (1):0.121 (1).

IN THE TITLE COMPOUND [SYSTEMATIC NAME: N-(carbamoyl-carb-a-mo-thio-yl)benzamide], C(9)H(9)N(3)O(2)S, the benzoyl and terminal urea fragments adopt cisoid and transoid conformations, respectively, with respect to the S atom. The benzoyl and thio-biuret groups are almost coplanar, making a dihedral angle of 8.48 (5)°. The mol-ecular structure is stabilized by an intra-molecular N-H⋯O hydrogen bond. In the crystal, N-H⋯O and N-H⋯S hydrogen bonds link the mol-ecules into a sheet parallel to the bc plane.

In the title compound, C(4)H(6)N(2)OS(2), the dihedral angle between the five-membered heterocyclic ring and the plane of the eth-oxy group is 4.9 (2)°. The 1,3,4-thiadiazole-2-thione unit is planar, with an r.m.s. deviation of 0.011 Å from the corresponding squares plane defined by the seven constituent atoms. In the crystal, pairs of N-H⋯S hydrogen bonds link the mol-ecules into inversion dimers.

In the title compound, C(11)H(13)NO(3)S, the dihedral angle between the benzyl and carbamate groups is 12.67 (10)°. The S atom and the carbonyl O atom are positioned anti to each other. In the crystal, pairs of N-H⋯S hydrogen bonds link mol-ecules into inversion dimers.

In the title compound, C(11)H(11)N(3)O(2)S, the dihedral angle between the thia-diazole and phenyl rings is 28.08 (7)°. In the crystal, mol-ecules are linked into an inversion dimer by a pair of inter-molecular N-H⋯N hydrogen bonds with an R(2) (2)(8) graph-set motif.

In the title compound, C(4)H(5)N(3)OS(2)·2C(2)H(6)OS, the five-membered heterocyclic ring and the N-(C=O)-C plane of the acetamide group are essentially co-planar, with a dihedral angle of 1.25 (3)°. Inter-molecular N-H⋯O hydrogen bonds between the acetamide compound and the dimethyl sulfoxide mol-ecules stabilize the crystal structure. The two dimethyl sulfoxide mol-ecules are each disordered over two positions with occupancy ratios of 0.605 (2):0.395 (2) and 0.8629 (18):0.1371 (18).