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Cocrystallization of 4-carboxypiperdine with 5-nitro­isophthalic acid afforded the title salt, 2C6H12NO2+·C8H3NO62−, in which the heterocyclic N atoms are protonated and the carboxylic acid groups are deprotonated. In the crystal, inter­molecular N—H...O and O—H...O hydrogen-bonding inter­actions assemble the ions into a three-dimensional network.
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