The salt{[NH2C(NH2)2]2}(C7H10O4)(H2O)(I) was isolated from reaction between aqueous solutions of 3,3-dimethylglutaric anhydride and guanidinium carbonate. It crystallizes in the triclinic space group P-1 with Z = 2, a = 8.7314(10) Å, b = 9.1938(19) Å, c = 10.9182(18) Å, α = 73.118(13)°, β = 79.067(13)°, γ = 76.353(13)° and V = 808.1 (2) Å3. The asymmetric unit is comprised of a guanidinium cation, a 3,3-dimethylglutarate anion and a molecule of water. In the structure, guanidinium cations, 3,3-dimethylglutarate anions and water molecules are connected through expanses N–H•••O and O–H•••O inter species hydrogen bonds leading to a supramolecular three dimensional structure.
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