3-(4-Amino-3-ethyl-5-sulfanyl-idene-4,5-dihydro-1H-1,2,4-triazol-1-yl)-3-(2-chloro-phen-yl)-1-phenyl-propan-1-one.

In the title mol-ecule, C(19)H(19)ClN(4)OS, the 1,2,4-triazole ring forms dihedral angles of 86.0 (2) and 65.6 (2)° with the phenyl and chloro-phenyl rings, respectively. In the crystal, inter-molecular N-H⋯S and N-H⋯O hydrogen bonds link mol-ecules into centrosymmetric dimers, which are further linked into chains in [001] via weak C-H⋯π inter-actions.

3-Methyl-6-trichloro-methyl-1,2,4-triazolo[3,4-b][1,3,4]thia-diazole.

In the crystal structure of the title compound, C(5)H(3)Cl(3)N(4)S, two mol-ecules related by a centre of symmetry demonstrate extremely short inter-molecular S⋯N contacts of 2.783 (2) Å. The crystal packing also exhibits π-π inter-actions indicated by a short distance of 3.340 (1) Šbetween the centroids of the triazole rings of neighbouring mol-ecules.

3-[3-Methyl-4-(4-nitro-benzyl-idene-amino)-5-sulfanyl-idene-4,5-dihydro-1H-1,2,4-triazol-1-yl]-1,3-diphenyl-propan-1-one dichloro-methane monosolvate.

In the title compound, C(25)H(21)N(5)O(3)S·CH(2)Cl(2), the dichloro-methane solvent mol-ecule is disordered over four positions, with an occupancy ratio of 0.271 (3):0.3884 (18):0.298 (2):0.0424 (15). The 1,2,4-triazole ring makes dihedral angles of 47.3 (2)/87.3 (2) and 3.6 (2)° with the phenyl and nitro-phenyl rings, respectively. An intra-molecular C-H⋯S hydrogen bond results in the formation of an almost planar six-membered ring [r.m.s. derivation = 0.0051 (2) Å]. Inter-molecular C-H⋯O hydrogen bonding consolidates the structure.

2-(4-Bromo-phen-yl)quinoxaline.

In the title compound, C(14)H(9)BrN(2), the benzene and quinoxaline rings are almost coplanar [r.m.s. deviation = 0.0285 (3) Šand dihedral angle = 2.1 (2)°].