title: 2-(2-{[2-(2-Pyridylcarbon-yl)hydrazono]meth-yl}phen-oxy)acetic acid.
abstract: In the title compound, C(15)H(13)N(3)O(4), the pyridine and benzene rings are nearly coplanar [dihedral angle = 4.92 (12)°]. The maximum deviation from the best least-squares plane calculated for the main mol-ecular skeleton is 0.1722 (1) Å for the carbonyl O atom. In the crystal, inter-molecular O-H⋯O hydrogen bonds connect the mol-ecules into a chain, while π-π stacking inter-actions between the pyridine and benzene rings [centroid-centroid distance = 3.9162 (8) Å and offset angle = 27.20°] complete a two-dimensional network.
authors.affiliation: College of Chemical and Biological Engineering (Guilin University of Technology), Guilin 541004, People's Republic of China.
authors.forename: Bao-Yu
authors.initials: BY
authors.lastname: Liu
authors.forename: Zheng
authors.initials: Z
authors.lastname: Liu
authors.forename: Guo-Rui
authors.initials: GR
authors.lastname: Wang