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The anion of the title salt, 2[C(NH 2 ) 3 ] + ·C 2 N 8 O 2   2− , lies on a center of inversion and its two five-membered rings are coplanar. The guanidinium cation forms N—H⋯O and N—H⋯N hydrogen bonds to the anion, generating an eight-membered ring. Other hydrogen bonds lead to the formation of a three-dimensional network.

Bis[(diaminomethylidene)azanium] 5-(1-oxido-1H-1,2,3,4-tetrazol-5-yl)-1H-1,2,3,4-tetrazol-1-olate