Methyl 4-{N′-[(1E)-1-(pyrazin-2-yl)ethyl­idene]hydrazinecarbon­yl}benzoate

The title Schiff base, C15H14N4O3, was synthesized by the condensation reaction between caprylic hydrazide and 2-acetyl­pyrazine. There are two independent pseudo-enanti­omeric mol­ecules, A and B, in the asymmetric unit that differ mainly in the orientation of the hydrazone units. For example, the dihedral angles between the benzene and pyrazine rings are 20.836 (13) (A) and 15.701 (14)° (B). The mol­ecular packing features N—H⋯O hydrogen bonds that lead to a twisted supra­molecular chain along the b-axis direction. The presence of C—H⋯O inter­actions consolidates the chains into a three-dimensional architecture. The studied sample was a two-component twin.