Figure 2.

A partial packing diagram of compound (I) around the disordered water mol­ecule in bis­(2-carb­oxy­pyridinium) chloranilate dihydrate (A) and bis­(pyridinium-2-carboxyl­ate) chloranilic acid dihydrate (B), showing O—H⋯O and N—H⋯O hydrogen bonds (dashed lines). [Symmetry codes: (ii) −x, −y, −z + 1; (iii) −x + 1, −y, −z + 1.]