title: 2-(2-{[2-(4-Pyridylcarbon-yl)hydrazinyl-idene]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 perpendicular [dihedral angle = 84.24 (5)°]. In the crystal structure, classical O-H⋯N hydrogen bonding between the OH group of the carboxyl unit and a neighbouring pyridine ring N atom and N-H⋯O hydrogen bonding between the imine NH group and a neighbouring O atom of an acyl unit, together with complementary non-classical C-H⋯O hydrogen bonds between carboxyl O atoms and neighbouring CH groups, link the mol-ecules into a three-dimensional system.
authors.forename: Jin Hong
authors.initials: JH
authors.lastname: Xia
authors.forename: Bao Yu
authors.initials: BY
authors.lastname: Liu
authors.forename: Zheng
authors.initials: Z
authors.lastname: Liu