4-(furan-2-carbonyl)piperazin-1-ium 3,5-dinitrobenzoate

In the cation of the title salt, C9H13N 2O2+·C7H3N 2O6-, the piperazine ring adopts a slightly distorted chair conformation. Twofold rotational disorder is exhibited by the furan ring in a 0.430 (4):0.570 (4) ratio. In the crystal, N-H�O hydrogen bonds link the ions into chains along 010. Additional weak C-H�O interactions are observed, leading to a supramolecular layer parallel to (011)