Triethylaminium–trimesate–trimesic acid–water (1/1/1/2).

The asymmetric unit of the title compound, C6H16N+·C9H5O6−·C9H6O6·2H2O, consists of a protonated triethylamine cation, one singly deprotonated trimesate anion, one trimesic acid molecule, and two water molecules. The trimesic acid molecules form stacks, while pairs of parallel anions also have π–π interactions; the perpendicular distances between adjacent parallel benzene rings are 3.291 (1), 3.347 (1) and 3.390 (1) Å. Intermolecular hydrogen bonds are found, with all O—H and N—H groups as donors, forming a three-dimensional network. [ABSTRACT FROM AUTHOR]