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The title mol­ecule, C9H7ClN4OS, is almost planar, with an r.m.s. deviation of 0.034 (2) Å for the mean plane through all the non-H atoms. Intra­molecular N—H...O and N—H...N hydrogen bonds form S(6) and S(5) ring motifs, respectively. In the crystal, mol­ecules are assembled into inversion dimers through pairs of co-operative N—H...Cl inter­actions. These dimers are connected along the b axis by N—H...O and N—H...S hydrogen bonds, generating layers parallel to (103). The layers are further connected along the a axis into a three-dimensional network, through weak π–π stacking inter­actions [centroid–centroid distance = 3.849 (2) Å].

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In the title compound, C14H13ClN4S, obtained from a reaction of 2-benzoyl-4-chloro­aniline with thio­semicarbazide in ethanol, the dihedral angle between the aromatic rings is 81.31 (13)°. In the crystal, the mol­ecules are linked by three N—H...S hydrogen bonds, forming centrosymmetric rings with set-graph motif R22(8) and R22(18), and resulting in the formation of a two-dimensional network lying parallel to (010).

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In the title compound, C13H13ClO4, the dihedral angle between the chloro­benezene ring and the least-squares plane through the 4-meth­oxy-2-oxobut-3-enoate ethyl ester residue (r.m.s. deviation = 0.0975 Å) is 54.10 (5)°. In the crystal, mol­ecules are connected by meth­oxy–ketone and benzene–carboxyl­ate carbonyl C—H...O inter­actions, generating a supra­molecular layer in the ac plane.
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