Figure 1
The molecular structures of the ions comprising the title salt, showing the atom-labelling scheme and displacement ellipsoids at the 50% probability level: (a) 2-({[(pyridin-1-ium-2-ylmethyl)carbamoyl]formamido}methyl)pyridin-1-ium, and (b) 3,5-dicarboxybenzoate; unlabelled atoms are related by the symmetry operation −x, 1 − y, 1 − z. |