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The anion of the title salt, 2C4H12N+·S2O32−·4H2O, possesses approximate C3v symmetry. The water molecules themselves engage in hydrogen bonding, forming a ribbon running along the a axis; adjacent chains are linked to the thiosulfate anions by hydrogen bonds, forming a three-dimensional network. The cavities in the network are occupied by the tetramethylammonium counter ions.