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In the crystal structure of the title compound, C5H14N22+·2HC2O4−, the two crystallographically independent hydrogen oxalate anions are linked by strong intermolecular O—H...O hydrogen bonds, forming two independent corrugated chains parallel to the b axis. These chains are further connected by N—H...O and C—H...O hydrogen bonds originating from the organic cations, forming a three-dimensional network. The diprotonated piperazine ring adopts a chair conformation, with the methyl group occupying an equatorial position.