In the title compound, C(20)H(15)ClN(4)O(7)S·4CH(3)COOH, the central o-vanillin group makes dihedral angles of 9.50 (11) and 42.86 (7)°, respectively, with its attached pyridine and nitro-benzene rings. The crystal packing is stabilized by N-H⋯O, O-H⋯O and O-H⋯N hydrogen bonds and C-H⋯O inter-actions, leading to an infinite three-dimensional network. A short intramolecular C-H⋯O contact is also seen.
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| http://dx.doi.org/10.1107/S1600536808034089 | DOI Listing |
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