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The crystal structures of three isomeric ( E )- N -methyl- N '-(nitro-benzyl-idene)-2-(thio-phen-2-yl)acetohydrazides (formula C 14 H 13 N 3 O 3 S) are described, with the nitro group in ortho , meta and para positions in the benzene ring. In each crystal structure, mol-ecules are linked by various weak inter-actions (C-H⋯O and C-H⋯π bonds, and π-π stacking), leading to three-dimensional networks in each case, but with little similarity between them.

Different weak interactions in the crystals of three isomeric (E)-N-methyl-N′-(nitrobenzylidene)-2-(thiophen-2-yl)acetohydrazides