Benzene-1,3,5-tricarb­oxy­lic acid–5-(pyridin-1-ium-3-yl)-5H-1,2,3,4-tetra­zol-5-ide (1/1)

The asymmetric unit of the title compound, C(6)H(5)N(5)·C(9)H(6)O(6), comprises a full mol­ecule each of neutral trimesic acid (tma) and zwitterionic 5-(pyridin-1-ium-3-yl)-5H-1,2,3,4-tetra­zol-5-ide (ptz). The components are linked into a two-dimensional layer by a combination of O—H⋯O, O—H⋯N, N—H⋯O and N—H⋯N hydrogen bonds parallel to the (10[Image: see text]) plane. Layers comprising alternating rows of tma and ptz are linked into a three-dimensional network by C—H⋯O and π–π inter­actions between tma and tetra­zolate rings [centroid–centroid distance = 3.763 (2) Å], and between pyridinium and tetra­zolate rings [centroid–centroid distance = 3.745 (2) Å].