title: (2E)-2-Hydroxy-imino-N'-[(E)-2-pyridyl-methyl-ene]propanohydrazide.
abstract: In the title compound, C(9)H(10)N(4)O(2), the pyridine ring is twisted by 16.5 (1)° from the mean plane defined by the remaining non-H atoms. An intra-molecular N-H⋯N inter-action is present. In the crystal, inter-molecular O-H⋯N and N-H⋯O hydrogen bonds link mol-ecules into layers parallel to the bc plane. The crystal packing exhibits π-π inter-actions indicated by the short distance of 3.649 (1) Å between the centroids of the pyridine rings of neighbouring mol-ecules.
authors.forename: Yurii S
authors.initials: YS
authors.lastname: Moroz
authors.forename: Valentina A
authors.initials: VA
authors.lastname: Kalibabchuk
authors.forename: Elżbieta
authors.initials: E
authors.lastname: Gumienna-Kontecka
authors.forename: Viktor V
authors.initials: VV
authors.lastname: Skopenko
authors.forename: Svetlana V
authors.initials: SV
authors.lastname: Pavlova