rac-4-Carbamoylpiperidinium cis-2-car­boxy­cyclo­hexane-1-carboxyl­ate

In the title racemic salt, C(6)H(13)N(2)O(+)·C(8)H(11)O(4) (−), formed from the reaction of cis-cyclo­hexane-1,2-dicarb­oxy­lic anhydride with isonipecotamide, the cations are linked into duplex chain substructures through both centrosymmetric cyclic head-to-head ‘amide motif’ hydrogen-bonding associations [graph set R (2) (2)(8)] and ‘side-by-side’ R (2) (2)(14) associations. The anions are incorporated into the chains through cyclic R (4) (3)(10) inter­actions involving amide and piperidinium N—H⋯O(carbox­yl) hydrogen bonds which, together with inter-anion carb­oxy­lic acid O—H⋯O(carbox­yl) hydrogen bonds, give a two-dimensional layered structure extending along (011).