title: 2-(1,3-Dioxoisoindolin-2-yl)acetic acid-N'-[(E)-4-meth-oxy-benzyl-idene]pyridine-4-carbohydrazide (2/1).
abstract: In the crystal structure of the title compound, 2C(10)H(7)NO(4)·C(14)H(13)N(3)O(2), the two independent acid mol-ecules are connected through strong O-H⋯N and O-H⋯O hydrogen bonds to the central mol-ecule of the anti-tubercular drug N'-[(E)-4-meth-oxy-benzyl-idene]pyridine-4-carbohydrazide. Two such trimolecular units related by an inversion centre inter-act through a pair of N-H⋯O hydrogen bonds, forming a 3 + 3 mol-ecular aggregate. The dihedral angle between the aromatic rings of the hydrazone mol-ecule is 1.99 (12)°. The crystal packing features weak C-H⋯O and π-π stacking inter-actions, with centroid-centroid distances of 3.8460 (19) and 3.8703 (13) Å.
authors.affiliation: 'Vinča' Institute of Nuclear Sciences, Laboratory of Theoretical Physics and Condensed Matter Physics, University of Belgrade, PO Box 522, 11001 Belgrade,  Serbia.
authors.forename: Sladjana B
authors.initials: SB
authors.lastname: Novaković
authors.forename: Goran A
authors.initials: GA
authors.lastname: Bogdanović
authors.forename: Shaaban K
authors.initials: SK
authors.lastname: Mohamed
authors.forename: Mustafa R
authors.initials: MR
authors.lastname: Albayati
authors.forename: Ayad S
authors.initials: AS
authors.lastname: Hameed