2-(1,3-Dioxoisoindolin-2-yl)acetic acid #8211;N #8242;-[(E)-4-methoxybenzylidene]pyridine-4-carbohydrazide (2/1)

In the crystal structure of the title compound, 2C10H7NO4·C14H13N3O2, the two independent acid molecules are connected through strong O—H...N and O—H...O hydrogen bonds to the central molecule of the antitubercular drug N′-[(E)-4-methoxybenzylidene]pyridine-4-carbohydrazide. Two such trimolecular units related by an inversion centre interact through a pair of N—H...O hydrogen bonds, forming a 3 + 3 molecular aggregate. The dihedral angle between the aromatic rings of the hydrazone molecule is 1.99 (12)°. The crystal packing features weak C—H...O and π–π stacking interactions, with centroid–centroid distances of 3.8460 (19) and 3.8703 (13) Å.