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In the title compound, 2C6H10N22+·P4O124−, which involves a doubly protonated 3-ammoniomethylpyridinium cation and a cyclotetraphosphate anion, the cyclotetraphosphoric ring is arranged around an inversion center and the organic entity alternates with it, forming hybrid ribbons parallel to the b axis. The crystal structure is stabilized by a three-dimensional network of N—H...O and weaker C—H...O hydrogen bonds.