2-(1,3-Dioxoisoindolin-2-yl)acetic acid–N′-[(E)-4-meth­oxy­benzyl­idene]pyridine-4-carbohydrazide (2/1)

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 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.