2-Carboxy-quinolinium-2,4,6-trinitro-benzene-sulfonate-quinolinium-2-carboxyl-ate (1/1/1).

The structure of the title adduct compound, C(10)H(8)NO(2) (+)·C(6)H(2)N(3)O(9)S(-)·C(10)H(7)NO(2), from the reaction of 2,4,6-trinitro-benzene-sulfonic acid (picrylsulfonic acid) with quinoline-2-carboxylic acid (quinaldic acid) in 2-propanol-water, has been determined at 130 (2) K. The cation and the adduct species form a twisted cyclic hydrogen-bonded R(2) (2)(10) pseudo-dimer which is extended into a one-dimensional chain structure through short head-to-tail carboxylic acid O-H⋯O(carbox-yl) associations [O⋯O = 2.4711 (19) Å]. The picrylsulfonate anions are attached peripherally by single N-H⋯O(sulfonate) hydrogen bonds [N⋯O = 2.8643 (19) Å].